FARKAS, B. PRESENTATION OF THE RAIL FREIGHT MARKET’S CONCENTRATION WITH RESPECT TO THE GAS MARKET WITH THE HELP OF THE HERFINDAL-HIRSCHMAN INDEX. Science and Transport Progress , [S. l.], n. 6(66), p. 69–78, 2016. DOI: 10.15802/stp2016/90474. Disponível em: https://stp.ust.edu.ua/article/view/90474. Acesso em: 3 may. 2024.