Bartkevičius, S., R. Kragnys, and K. Šarkauskas. “Global Variables in Colored Petri Nets”. Elektronika ir Elektrotechnika 69, no. 5 (May 20, 2006): 45–48. Accessed February 12, 2026. https://eejournal.ktu.lt/index.php/elt/article/view/10676.