Rohmah, D. S., and D. R. S. Saputro. “Clustering Data Dengan Algoritme Fuzzy C-Means Berbasis Indeks Validitas Partition Coefficient and Exponential Separation (PCAES)”. PRISMA, Prosiding Seminar Nasional Matematika, Vol. 3, Feb. 2020, pp. 58-63, http://journal.unnes.ac.id/sju/prisma/article/view/37649.