Thanh, Hoang Chi, and Piotr Proszynski. “Composition of Concurrency Relations and Marked Simple Nets”. <i>Journal of Computer Science and Cybernetics</i> 1, no. 2 (August 6, 2015): 7–13. Accessed November 6, 2025. https://jcc.vast.vn/jcc/article/view/6673.