BUTKEVIČIUS, Jonas. Modelling of the dependence of travel frequency on the length and duration of a journey. Improvement of city passenger transport systems. Transport, [S. l.], v. 17, n. 6, p. 223–225, 2002. DOI: 10.3846/16483840.2002.10414047. Disponível em: https://journals.vilniustech.lt/index.php/Transport/article/view/8767. Acesso em: 16 may. 2025.