Rahim, Rahela, Ku Ruhana Ku-Mahamud, and Abu Talib Othman. 2002. “Performance Modeling of E-Procurement Workflow Using Generalised Stochastic Petri Net (GSPN)”. Journal of Information and Communication Technology 1 (1): 55-68. https://doi.org/10.32890/jict2002.1.1.5.