Mohammad Al-Abadi, F., and فراس. “Using the Petri Network to Organize Resource Sharing Between Two Processors”. AL-Rafidain Journal of Computer Sciences and Mathematics, vol. 6, no. 1, Jan. 2009, pp. 123-3, https://tanmiyat.uomosul.edu.iq/index.php/csmj/article/view/36900.