Chandra, N., S. Supriyanto, and R. Renny. “SISTEM ANTRIAN MODELGEO/G/1 DENGAN VACATION”. UJMC (Unisda Journal of Mathematics and Computer Science), Vol. 1, no. 01, June 2015, pp. 47 -54, doi:https://doi.org/10.52166/ujmc.v1i01.436.