D. Samundeeswari, S. Vidhya, and T. Chitra Kalarani, “Expected Time to Recruitment for a Three Grade Manpower System with Bivariate Policy of Recruitment Using Geometric Process for Inter Decision Times”, IJET, vol. 7, no. 3.34, pp. 702–704, Sep. 2018, doi: 10.14419/ijet.v7i3.34.19455.