K. M. Ghafour, R. Ramli, and N. ZuraZaibidi, “A Simulation Approach to Determine the Probability of Demand during Lead-Time When Demand Distributed Normal and Lead-Time Distributed Gamma”, JEBS, vol. 6, no. 11, pp. 840–847, Nov. 2014, doi: 10.22610/jebs.v6i11.543.