Search results for "k-means clustering"

Hits ?▲	Authors	Title	Venue	Year	Link	Author keywords
3	Chunhua Su, Justin Zhan, Kouichi Sakurai	Importance of Data Standardization in Privacy-Preserving K-Means Clustering.	DASFAA Workshops	2009	DBLP DOI BibTeX RDF	secure approximation, cryptographic protocol, k-means clustering, data standardization
3	Nursuriati Jamil, Siti 'Aisyah Sa'adan	Automatic Image Annotation Using Color K-Means Clustering.	IVIC	2009	DBLP DOI BibTeX RDF	RGB model, initialization mode, cluster number, K-means clustering, Automatic image annotation
3	S. A. Arul Shalom, Manoranjan Dash, Minh Tue	Efficient K-Means Clustering Using Accelerated Graphics Processors.	DaWaK	2008	DBLP DOI BibTeX RDF	GPGPU, K-means clustering, Computational efficiency
3	Mahir Can Doganay, Thomas Brochmann Pedersen, Yücel Saygin, Erkay Savas, Albert Levi	Distributed privacy preserving k-means clustering with additive secret sharing.	PAIS	2008	DBLP DOI BibTeX RDF	secret sharing, k-means clustering, privacy preserving data mining, secure multiparty computation
3	Heng Huang, Chris H. Q. Ding, Dijun Luo, Tao Li	Simultaneous tensor subspace selection and clustering: the equivalence of high order svd and k-means clustering.	KDD	2008	DBLP DOI BibTeX RDF	2dsvd, hosvd, k-means clustering
3	Shekhar R. Gaddam, Vir V. Phoha, Kiran S. Balagani	K-Means+ID3: A Novel Method for Supervised Anomaly Detection by Cascading K-Means Clustering and ID3 Decision Tree Learning Methods.	IEEE Trans. Knowl. Data Eng.	2007	DBLP DOI BibTeX RDF	receiver operating characteristic (ROC) curves, classification, decision trees, Anomaly detection, k-Means clustering
3	Shai Ben-David	A framework for statistical clustering with constant time approximation algorithms for K-median and K-means clustering.	Machine Learning	2007	DBLP DOI BibTeX RDF	k-median clustering, Sample-based clustering, Description schemes, Approximation algorithms, k-means clustering
3	Danny Z. Chen, Mark A. Healy, Chao Wang, Bin Xu	Geometric Algorithms for the Constrained 1-D K -Means Clustering Problems and IMRT Applications.	FAW	2007	DBLP DOI BibTeX RDF	staircase-Monge property, matrix search algorithm, minimum-weight K-link path algorithm, intensity modulated radiation therapy (IMRT), K-means clustering
3	Xiaoliu Chen, Imran Shafiq Ahmad	Shape-Based Image Retrieval Using k -Means Clustering and Neural Networks.	PSIVT	2007	DBLP DOI BibTeX RDF	shape-based image retrieval, image retrieval, k-means clustering, Zernike moments, moment-invariants
3	Paul Bunn, Rafail Ostrovsky	Secure two-party k-means clustering.	ACM Conference on Computer and Communications Security	2007	DBLP DOI BibTeX RDF	k-means clustering, secure multiparty computation
3	Ruoming Jin, Anjan Goswami, Gagan Agrawal	Fast and exact out-of-core and distributed k-means clustering.	Knowl. Inf. Syst.	2006	DBLP DOI BibTeX RDF	Out-of-core datasets distributed, Confidence radius, k-means, k-means clustering, Boundary points
3	Ling Wang, Liefeng Bo, Licheng Jiao	A Modified K-Means Clustering with a Density-Sensitive Distance Metric.	RSKT	2006	DBLP DOI BibTeX RDF	K-Means clustering, distance metric, dissimilarity measure
3	Hui Xiong, Junjie Wu, Jian Chen	K-means clustering versus validation measures: a data distribution perspective.	KDD	2006	DBLP DOI BibTeX RDF	coefficient of variation (CV), entropy, K-means clustering
3	Maya Gokhale, Janette Frigo, Kevin McCabe, James Theiler, Christophe Wolinski, Dominique Lavenier	Experience with a Hybrid Processor: K-Means Clustering.	The Journal of Supercomputing	2003	DBLP DOI BibTeX RDF	configurable system on a chip, CSOC, Excalibur, FPGA, image processing, k-means clustering
2	D. Sculley	Web-scale k-means clustering.	WWW	2010	DBLP DOI BibTeX RDF	sparse solutions, scalability, unsupervised clustering
2	D. S. Guru, S. Manjunath, P. Shivakumara, Chew Lim Tan	An eigen value based approach for text detection in video.	Document Analysis Systems	2010	DBLP DOI BibTeX RDF	text localization, K-means clustering, video text detection, eigen analysis
2	Palaiahnakote Shivakumara, Anjan Dutta, Chew Lim Tan, Umapada Pal	A new wavelet-median-moment based method for multi-oriented video text detection.	Document Analysis Systems	2010	DBLP DOI BibTeX RDF	angle projection, multi-oriented text line detection, wavelet-median-moments, K-means clustering, video text detection
2	Souptik Datta, Chris Giannella, Hillol Kargupta	Approximate Distributed K-Means Clustering over a Peer-to-Peer Network.	IEEE Trans. Knowl. Data Eng.	2009	DBLP DOI BibTeX RDF
2	Miquel Ferrer, Ernest Valveny, Francesc Serratosa, Itziar Bardají, Horst Bunke	Graph-Based k-Means Clustering: A Comparison of the Set Median versus the Generalized Median Graph.	CAIP	2009	DBLP DOI BibTeX RDF
2	Weizhong Zhao, Huifang Ma, Qing He	Parallel K-Means Clustering Based on MapReduce.	CloudCom	2009	DBLP DOI BibTeX RDF	Parallel clustering, Data mining, K-means, MapReduce, Hadoop
2	Fadila Bentayeb, Cécile Favre	RoK: Roll-Up with the K-Means Clustering Method for Recommending OLAP Queries.	DEXA	2009	DBLP DOI BibTeX RDF	analysis level, dimension hierarchy, clustering, personalization, OLAP, recommendation, adaptative system, K-means, schema evolution
2	Junjie Wu, Hui Xiong, Jian Chen	Adapting the right measures for K-means clustering.	KDD	2009	DBLP DOI BibTeX RDF	external criteria, k-means, cluster validation
2	Nan Xing, Imran Shafiq Ahmad	Shape-based image retrieval.	MoMM	2009	DBLP DOI BibTeX RDF	fuzzy k-means clustering, shape-based retrieval, image retrieval, Zernik moments, moment invariants
2	Zheng Zhang, Zheng Zhao, Gang Bai	3D Representative Face and Clustering Based Illumination Estimation for Face Recognition and Expression Recognition.	ISNN	2009	DBLP DOI BibTeX RDF	Representative face, K-Means clustering, Illumination estimation
2	Numanul Subhani, Alioune Ngom, Luis Rueda, Conrad J. Burden	Microarray Time-Series Data Clustering via Multiple Alignment of Gene Expression Profiles.	PRIB	2009	DBLP DOI BibTeX RDF	Profile Alignment, Microarrays, k-Means Clustering, Time-Series Data, Cubic Spline, Gene Expression Profiles
2	Hui Xiong, Michael Steinbach, Arifin Ruslim, Vipin Kumar	Characterizing pattern preserving clustering.	Knowl. Inf. Syst.	2009	DBLP DOI BibTeX RDF	Pattern preserving clustering, Hierarchical clustering, K-means clustering, Hyperclique pattern
2	Mark Junjie Li, Michael K. Ng, Yiu-ming Cheung, Joshua Zhexue Huang	Agglomerative Fuzzy K-Means Clustering Algorithm with Selection of Number of Clusters.	IEEE Trans. Knowl. Data Eng.	2008	DBLP DOI BibTeX RDF
2	Jun Sakuma, Shigenobu Kobayashi	Large-Scale k-Means Clustering with User-Centric Privacy Preservation.	PAKDD	2008	DBLP DOI BibTeX RDF	data mining, clustering, privacy, peer-to-peer, k-means
2	Nima Asgharbeygi, Arian Maleki	Geodesic K-means clustering.	ICPR	2008	DBLP DOI BibTeX RDF
2	Sameeh Ullah, Fakhri Karray, Jin-Myung Won	Non-dominated Sorting Evolution Strategy-based K-means clustering algorithm for accent classification.	ICPR	2008	DBLP DOI BibTeX RDF
2	Hisashi Kashima, Jianying Hu, Bonnie K. Ray, Moninder Singh	K-means clustering of proportional data using L1 distance.	ICPR	2008	DBLP DOI BibTeX RDF
2	Tse-Wei Chen, Yi-Ling Chen, Shao-Yi Chien	Fast image segmentation based on K-Means clustering with histograms in HSV color space.	MMSP	2008	DBLP DOI BibTeX RDF
2	Shengwen Tian, Hongyong Yang, Yilei Wang, Ali Li	An Improved K-Means Clustering Algorithm Based on Spectral Method.	ISICA	2008	DBLP DOI BibTeX RDF	Clustering, Measure, Spectral Method, K-means algorithm
2	Yasser Yasami, S. Khorsandi, Saadat Pour Mozaffari, A. Jalalian	An unsupervised network anomaly detection approach by k-Means clustering & ID3 algorithms.	ISCC	2008	DBLP DOI BibTeX RDF
2	Grigorios Tzortzis, Aristidis Likas	The global kernel k-means clustering algorithm.	IJCNN	2008	DBLP DOI BibTeX RDF
2	Xinwu Li	A Volume Segmentation Algorithm for Medical Image Based on K-Means Clustering.	IIH-MSP	2008	DBLP DOI BibTeX RDF	Direct Volume segmentation, Medical data field, K-means clustering
2	Kaspar Riesen, Horst Bunke	Kernel k-Means Clustering Applied to Vector Space Embeddings of Graphs.	ANNPR	2008	DBLP DOI BibTeX RDF
2	Yan Song, Anan Liu, Lin Pang, Shouxun Lin, Yongdong Zhang, Sheng Tang	A Novel Image Text Extraction Method Based on K-Means Clustering.	ACIS-ICIS	2008	DBLP DOI BibTeX RDF
2	Diana Inkpen, Marc Stogaitis, François DeGuire, Muath Alzghool	Clustering for Photo Retrieval at Image CLEF 2008.	CLEF	2008	DBLP DOI BibTeX RDF	WordNet-based clustering, Information retrieval, image retrieval, k-means clustering, text retrieval, photographs, agglomerative clustering
2	Nobuo Shimizu, Masahiro Mizuta	Functional Principal Points and Functional Cluster Analysis.	Computational Intelligence Paradigms	2008	DBLP DOI BibTeX RDF	Gaussian random functions, Orthogonal basis, Optimization, k-means clustering, Functional data analysis
2	Sariel Har-Peled, Akash Kushal	Smaller Coresets for k-Median and k-Means Clustering.	Discrete & Computational Geometry	2007	DBLP DOI BibTeX RDF
2	Supoj Hengpraprohm, Prabhas Chongstitvatana	Selecting Informative Genes from Microarray Data for Cancer Classification with Genetic Programming Classifier Using K-Means Clustering and SNR Ranking.	FBIT	2007	DBLP DOI BibTeX RDF
2	Pyo Jae Kim, Hyung Jin Chang, Dong Sung Song, Jin Young Choi	Fast Support Vector Data Description Using K-Means Clustering.	ISNN	2007	DBLP DOI BibTeX RDF
2	Dan Feldman, Morteza Monemizadeh, Christian Sohler	A PTAS for k-means clustering based on weak coresets.	Symposium on Computational Geometry	2007	DBLP DOI BibTeX RDF	approximation, k-mean, geometric optimization, coresets
2	Xiaojun Wang, Miriam Leeser	K-means Clustering for Multispectral Images Using Floating-Point Divide.	FCCM	2007	DBLP DOI BibTeX RDF
2	Chunhua Su, Feng Bao, Jianying Zhou, Tsuyoshi Takagi, Kouichi Sakurai	Privacy-Preserving Two-Party K-Means Clustering via Secure Approximation.	AINA Workshops	2007	DBLP DOI BibTeX RDF	secure approximation, clustering, privacy-preserving
2	Gobert N. Lee, Hiroshi Fujita	K-means Clustering for Classifying Unlabelled MRI Data.	DICTA	2007	DBLP DOI BibTeX RDF
2	Gregory A. Wilkin, Xiuzhen Huang	K-Means Clustering Algorithms: Implementation and Comparison.	IMSCCS	2007	DBLP DOI BibTeX RDF
2	Chris H. Q. Ding, Tao Li	Adaptive dimension reduction using discriminant analysis and K-means clustering.	ICML	2007	DBLP DOI BibTeX RDF
2	Kyung-A Yoon, Oh-Sung Kwon, Doo-Hwan Bae	An Approach to Outlier Detection of Software Measurement Data using the K-means Clustering Method.	ESEM	2007	DBLP DOI BibTeX RDF
2	Shai Ben-David, Dávid Pál, Hans-Ulrich Simon	Stability of k -Means Clustering.	COLT	2007	DBLP DOI BibTeX RDF
2	Yu-Chiang Frank Wang, David Casasent	New Weighted Support Vector K-means Clustering for Hierarchical Multi-class Classification.	IJCNN	2007	DBLP DOI BibTeX RDF
2	Dariusz Malyszko, Slawomir T. Wierzchon	Standard and Genetic k-means Clustering Techniques in Image Segmentation.	CISIM	2007	DBLP DOI BibTeX RDF
2	Yongwei Miao, Jieqing Feng, Chunxia Xiao, Qunsheng Peng, A. Robin Forrest	Differentials-Based Segmentation and Parameterization for Point-Sampled Surfaces.	J. Comput. Sci. Technol.	2007	DBLP DOI BibTeX RDF	point-sampled surface, segmentation, computer graphics, parameterization, multidimensional scaling, k-means clustering
2	Carlos Ordonez	Integrating K-Means Clustering with a Relational DBMS Using SQL.	IEEE Trans. Knowl. Data Eng.	2006	DBLP DOI BibTeX RDF	Clustering, SQL, K-means, relational DBMS
2	Tong Zhao, Arye Nehorai, Boaz Porat	K-means clustering-based data detection and symbol-timing recovery for burst-mode optical receiver.	IEEE Transactions on Communications	2006	DBLP DOI BibTeX RDF
2	Takashi Saegusa, Tsutomu Maruyama	An FPGA Implementation of K-Means Clustering for Color Images Based on Kd-Tree.	FPL	2006	DBLP DOI BibTeX RDF
2	Jianyu Li, Rui Lv, Zhanxin Yang, Shuzhong Yang, Hongwei Mo, Xianglin Huang	Construction of Small World Networks Based on K-Means Clustering Analysis.	International Conference on Computational Science	2006	DBLP DOI BibTeX RDF
2	Yunming Ye, Joshua Zhexue Huang, Xiaojun Chen, Shuigeng Zhou, Graham J. Williams, Xiaofei Xu	Neighborhood Density Method for Selecting Initial Cluster Centers in K-Means Clustering.	PAKDD	2006	DBLP DOI BibTeX RDF	Neighborhood-Based Clustering, Initial Cluster Center Selection, Clustering, k-means
2	Tsutomu Maruyama	Real-time K-Means Clustering for Color Images on Reconfigurable Hardware.	ICPR	2006	DBLP DOI BibTeX RDF
2	Qiang Guo, Wanhai Chen, Xingzhou Zhang, Zheng Li, Di Guan	Signal Sorting Based on SVC & K-Means Clustering in ESM Systems.	ICONIP	2006	DBLP DOI BibTeX RDF
2	Wei-bang Chen	An efficient hybrid clustering algorithm for molecular sequences classification.	ACM Southeast Regional Conference	2006	DBLP DOI BibTeX RDF	molecular sequence clustering, data mining, hidden Markov models (HMMs), k-means clustering, hierarchical agglomerative clustering
2	Xiaohong Jiang, Fen Dai, Hanqing Jiang	An Experimental Facial Synthesis System Using Graph Cut and Gradient Domain Fusion.	Edutainment	2006	DBLP DOI BibTeX RDF	Objective stroke, Background stroke, Automatic region selection, Gradient domain fusion, Energy minimization, Graph cut, K-means clustering
2	Fernando Bação, Victor Sousa Lobo, Marco Painho	Self-organizing Maps as Substitutes for K-Means Clustering.	International Conference on Computational Science	2005	DBLP DOI BibTeX RDF
2	Bernard Chen, Robert W. Harrison, Yi Pan, Phang C. Tai	Novel Hybrid Hierarchical-K-means Clustering Method (H-K-means) for Microarray Analysis.	CSB Workshops	2005	DBLP DOI BibTeX RDF
2	Tapio Elomaa, Heidi Koivistoinen	On Autonomous k-Means Clustering.	ISMIS	2005	DBLP DOI BibTeX RDF
2	Sariel Har-Peled, Akash Kushal	Smaller coresets for k-median and k-means clustering.	Symposium on Computational Geometry	2005	DBLP DOI BibTeX RDF	clustering, coresets
2	Canhui Wang, Yiqun Liu, Min Zhang, Shaoping Ma	Topic-Independent Web High-Quality Page Selection Based on K-Means Clustering.	AIRS	2005	DBLP DOI BibTeX RDF
2	Bobby D. Gerardo, Jaewan Lee, Yeon-Sung Choi, Malrey Lee	The K-Means Clustering Architecture in the Multi-stage Data Mining Process.	ICCSA	2005	DBLP DOI BibTeX RDF
2	Geetha Jagannathan, Rebecca N. Wright	Privacy-preserving distributed k-means clustering over arbitrarily partitioned data.	KDD	2005	DBLP DOI BibTeX RDF
2	Sean Luke, Keith Sullivan, Liviu Panait, Gabriel Catalin Balan	Tunably decentralized algorithms for cooperative target observation.	AAMAS	2005	DBLP DOI BibTeX RDF	multiagent systems, K-means clustering, hill-climbing
2	Dan Li, Jitender S. Deogun, William Spaulding, Bill Shuart	Dealing with Missing Data: Algorithms Based on Fuzzy Set and Rough Set Theories.	T. Rough Sets	2005	DBLP DOI BibTeX RDF	rough-fuzzy hybridization, rough sets, fuzzy sets, Missing data, K-means clustering, imputation
2	Anjan Goswami, Ruoming Jin, Gagan Agrawal	Fast and Exact Out-of-Core K-Means Clustering.	ICDM	2004	DBLP DOI BibTeX RDF
2	Chris H. Q. Ding, Xiaofeng He	Cluster Structure of K-means Clustering via Principal Component Analysis.	PAKDD	2004	DBLP DOI BibTeX RDF
2	Mantao Xu, Pasi Fränti	Delta-MSE Dissimilarity in Suboptimal K-Means Clustering.	ICPR	2004	DBLP DOI BibTeX RDF
2	Guihong Cao, Dawei Song, Peter Bruza	Fuzzy K-Means Clustering on a High Dimensional Semantic Space.	APWeb	2004	DBLP DOI BibTeX RDF
2	Chris H. Q. Ding, Xiaofeng He	K-means clustering via principal component analysis.	ICML	2004	DBLP DOI BibTeX RDF
2	Fazilah Othman, Rosni Abdullah, Nur'Aini Abdul Rashid, Rosalina Abdul Salam	Parallel K-Means Clustering Algorithm on DNA Dataset.	PDCAT	2004	DBLP DOI BibTeX RDF
2	Ting Su, Jennifer G. Dy	A Deterministic Method for Initializing K-Means Clustering.	ICTAI	2004	DBLP DOI BibTeX RDF
2	Maokuan Li, Yusheng Cheng, Honghai Zhao	Unlabeled Data Classification via Support Vector Machines and k-means Clustering.	CGIV	2004	DBLP DOI BibTeX RDF	Data Mining, Support Vector Machines, k-means clustering
2	Nils Raabe, Karsten Luebke, Claus Weihs	KMC/EDAM: A New Approach for the Visualization of K-Means Clustering Results.	GfKl	2004	DBLP DOI BibTeX RDF
2	Carlos Ordonez	Programming the K-means clustering algorithm in SQL.	KDD	2004	DBLP DOI BibTeX RDF	clustering, SQL, K-means
2	Huawu Deng, David A. Clausi	Unsupervised Segmentation of Synthetic Aperture Radar Sea Ice Imagery Using MRF Models.	CRV	2004	DBLP DOI BibTeX RDF	sea ice, image segmentation, texture, Markov random field (MRF), mixture model, synthetic aperture radar (SAR), K-means clustering, image feature, unsupervised segmentation, Gamma distribution, expectation-maximization (EM)
2	Lih-Ren Jen, Yuh-Jye Lee	Clustering Model Selection for Reduced Support Vector Machines.	IDEAL	2004	DBLP DOI BibTeX RDF	Reduced Set, k-means Clustering Algorithm, Support Vector Machine, Model Selection, Radial Basis Function Network, Gaussian Kernel
2	James F. Peters, Maciej Borkowski	K-means Indiscernibility Relation over Pixels.	Rough Sets and Current Trends in Computing	2004	DBLP DOI BibTeX RDF	classification, rough sets, Approximation, K-means clustering, digital image processing
2	Petros Drineas, Alan M. Frieze, Ravi Kannan, Santosh Vempala, V. Vinay	Clustering Large Graphs via the Singular Value Decomposition.	Machine Learning	2004	DBLP DOI BibTeX RDF	randomized algorithms, Singular Value Decomposition, k-means clustering
2	Dharmendra S. Modha, W. Scott Spangler	Feature Weighting in k-Means Clustering.	Machine Learning	2003	DBLP DOI BibTeX RDF	convex k-means algorithm, Fisher's discriminant analysis, clustering, feature selection, text mining, unsupervised learning, convexity, feature combination
2	Attila Gürsoy	Data Decomposition for Parallel K-means Clustering.	PPAM	2003	DBLP DOI BibTeX RDF
2	Daniel Jiménez, Edgardo Ferretti, Vicente Vidal, Paolo Rosso, Carlos F. Enguix	The influence of semantics in IR using LSI and K-means clustering techniques.	ISICT	2003	DBLP DOI BibTeX RDF
2	Zeger F. Knops, J. B. Antoine Maintz, Max A. Viergever, Josien P. W. Pluim	Normalized Mutual Information Based PET-MR Registration Using K-Means Clustering and Shading Correction.	WBIR	2003	DBLP DOI BibTeX RDF
2	Fang-Xiang Wu, Wen-Jun Zhang, Anthony J. Kusalik	Determination of the Minimum Sample Size in Microarray Experiments to Cluster Genes Using K-means Clustering. (PDF / PS)	BIBE	2003	DBLP DOI BibTeX RDF
2	Fang-Xiang Wu, Wen-Jun Zhang, Anthony J. Kusalik	A Genetic K-means Clustering Algorithm Applied to Gene Expression Data.	Canadian Conference on AI	2003	DBLP DOI BibTeX RDF
2	Jaideep Vaidya, Chris Clifton	Privacy-preserving k-means clustering over vertically partitioned data.	KDD	2003	DBLP DOI BibTeX RDF	privacy
2	Tapas Kanungo, David M. Mount, Nathan S. Netanyahu, Christine D. Piatko, Ruth Silverman, Angela Y. Wu	An Efficient k-Means Clustering Algorithm: Analysis and Implementation.	IEEE Trans. Pattern Anal. Mach. Intell.	2002	DBLP DOI BibTeX RDF	data mining, machine learning, Pattern recognition, computational geometry, knowledge discovery, k-means clustering, nearest-neighbor searching, k-d tree
2	Tapas Kanungo, David M. Mount, Nathan S. Netanyahu, Christine D. Piatko, Ruth Silverman, Angela Y. Wu	A local search approximation algorithm for k-means clustering.	Symposium on Computational Geometry	2002	DBLP DOI BibTeX RDF	clustering, approximation algorithms, computational geometry, local search, k-means
2	Attila Gürsoy, Ilker Cengiz	Parallel Pruning for K-Means Clustering on Shared Memory Architectures.	Euro-Par	2001	DBLP DOI BibTeX RDF
2	Jong Bae Kim, Hye Sun Park, Min Ho Park, Hang Joon Kim	A Real-Time Region-Based Motion Segmentation Using Adaptive Thresholding and K-Means Clustering.	Australian Joint Conference on Artificial Intelligence	2001	DBLP DOI BibTeX RDF
2	Kristof Van Laerhoven	Combining the Self-Organizing Map and K-Means Clustering for On-Line Classification of Sensor Data.	ICANN	2001	DBLP DOI BibTeX RDF
2	Mathias Kirsten, Stefan Wrobel	Extending K-Means Clustering to First-Order Representations.	ILP	2000	DBLP DOI BibTeX RDF
2	Khaled Alsabti, Sanjay Ranka, Vineet Singh	An Efficient Space-Partitioning Based Algorithm for the K-Means Clustering.	PAKDD	1999	DBLP DOI BibTeX RDF