Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) PELLEG D.,X-means : Extending k-means with efficient estimation of the number of clusters,"Proceedings of the Seventeenth International Conference on Machine Learning, San Francisco, Morgan Kaufmann, 2000-6",,,2000,,,727-734,https://cir.nii.ac.jp/crid/1570572701256147584,