@article{oai:repository.dl.itc.u-tokyo.ac.jp:00048967, author = {INABA, Mary and KATOH, Naoki and IMAI, Hiroshi}, issue = {6}, journal = {IEICE TRANSACTIONS on Information and Systems}, month = {Jun}, note = {PAPER}, pages = {1199--1206}, title = {Variance-Based k-Clustering Algorithms by Voronoi Diagrams and Randomization}, volume = {E83-D}, year = {2000} }