Tubis, Agnieszka A., Mateusz Rydlewski, and Magdalena Skiba. “Digital Maturity in Tram Systems: Model Design and Practical Application”. Bulletin of the Polish Academy of Sciences Technical Sciences 73, no. 6 (October 30, 2025): e155034. Accessed August 13, 2026. https://wydawnictwo.pan.pl/index.php/bpasts/article/view/808.