Kopytkov, D., and G. Samchuk. “STATISTICAL ASSESSMENT OF THE QUESTIONNAIRE SURVEY QUALITY FOR TRANSPORT FATIGUE IN URBAN PASSENGER TRANSPORTATION: Array”. Municipal Economy of Cities, vol. 6, no. 159, Nov. 2020, pp. 147-52, https://khg.kname.edu.ua/index.php/khg/article/view/5688.