Thanh, Hoang Chi, and Piotr Proszynski. “Composition of Concurrency Relations and Marked Simple Nets”. Journal of Computer Science and Cybernetics 1, no. 2 (August 6, 2015): 7–13. Accessed May 4, 2024. https://vjs.ac.vn/index.php/jcc/article/view/6673.