Hyunjoong Kim Han Kyul Kim Sungzoon Cho Improving spherical k-means for document clustering: Fast initialization, sparse centroid projection, and efficient cluster labeling. 113288 2020 150 Expert Syst. Appl. https://doi.org/10.1016/j.eswa.2020.113288 db/journals/eswa/eswa150.html#KimKC20a
