LailiyahS., and HafiyusholehM. “PERBANDINGAN ANTARA METODE K-MEANS CLUSTERING DENGAN GATH-GEVA CLUSTERING”. Jurnal Matematika MANTIK, Vol. 1, no. 2, May 2016, pp. 26-37, http://jurnalsaintek.uinsby.ac.id/index.php/mantik/article/view/59.