Sitompul, Melda Pita Uli, Opim Salim Sitompul, and Zakarias Situmorang. 2022. “Optimization of Determination Against K-Means Cluster Algorithm Using Elbow Creation”. Jurnal Teknik Informatika C.I.T Medicom 14 (1):1-9. https://doi.org/10.35335/cit.Vol14.2022.176.pp1-9.