“On Activity modelling in process modeling” (2001) The Annals of “Dunarea de Jos“ University of Galati. Fascicle III, Electrotechnics, Electronics, Automatic Control, Informatics, 24, pp. 59–67. Available at: https://ojs.ugal.ro/index.php/eeaci/article/view/778 (Accessed: 2 November 2026).