Sertić, Antun, Tomislav Mlinarić, and Zvonko Kavran. “Possibility of Identification of Permanent Way and Train Undercarriage Affecting Railway Traffic Safety”. Promet - Traffic&Transportation 11, no. 1 (1): 1-10. Accessed October 27, 2020. http://traffic.fpz.hr/index.php/PROMTT/article/view/1124.