Cahyaningtias, S., and R. Putri. “Analisis Keterkontrolan Model Penyebaran Virus Polio Tipe Vaccine-Derived Polio Virus (VDPV) Dan Wild Polio Virus (WPV)”. UJMC (Unisda Journal of Mathematics and Computer Science), Vol. 5, no. 01, June 2019, pp. 35 -40, doi:https://doi.org/10.52166/ujmc.v5i01.1492.