Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Inoue Kohei and Hara Kenji,An equivalence between log-sum-exp approximation and entropy regularization in K-means clustering,"Nonlinear Theory and Its Applications, IEICE",2185-4106,"The Institute of Electronics, Information and Communication Engineers",2020,11,4,446-453,https://cir.nii.ac.jp/crid/1390848647560842752,https://doi.org/10.1587/nolta.11.446