Vukić, L., G. Guidi, T. Poletan Jugović, and R. Oblak. “Comparison of External Costs of Diesel, LNG, and Electric Drive on a Ro-Ro Ferry Route”. Promet - Traffic&Transportation, Vol. 33, no. 3, June 2021, pp. 463-77, doi:10.7307/ptt.v33i3.3690.