Yurinanda, S., F. Yanuar, and D. Devianto. “The Property of Continuity And Positively Definite Characteristic Function of Compound Poisson Distribution As The Sum of Geometric Distribution”. Science and Technology Indonesia, vol. 3, no. 2, Apr. 2018, pp. 53-58, doi:10.26554/sti.2018.3.2.53-58.