T. A. Badmus , O. Y. Akingbade, R. A.Ganiyu, S. O. Olabiyisi. 2015. “Development of a Timed Coloured Petri Nets Model for Health Centre Patient Care Flow Processes”. International Journal of Engineering and Computer Science 4 (01). india. https://ijecs.in/index.php/ijecs/article/view/443.