Salman, Y. D., N. L. Hashim, M. Md Rejab, R. Romli, and H. Mohd. “Coverage Criteria for UML State Chart Diagram in Model-Based Testing”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 9, no. 2-11, Sept. 2017, pp. 85-89, https://jtec.utem.edu.my/jtec/article/view/2743.