Sitompul, M. P. U. ., O. S. . Sitompul, and Z. . Situmorang. “Optimization of Determination Against K-Means Cluster Algorithm Using Elbow Creation”. Jurnal Teknik Informatika C.I.T Medicom, vol. 14, no. 1, Mar. 2022, pp. 1-9, doi:10.35335/cit.Vol14.2022.176.pp1-9.