Mahmudah, U. and Lola, M. (2023) “A TWO-STEP CLUSTER FOR CLASSIFYING PROVINCES IN INDONESIA BASED ON ENVIRONMENTAL QUALITY”, BAREKENG: Jurnal Ilmu Matematika dan Terapan, 17(3), pp. 1685-1694. doi: 10.30598/barekengvol17iss3pp1685-1694.