GRAȚIELA, Brânză.
Sustainable Maritime Transportation System in European Union.
Constanta Maritime University Annals, [S.l.], v. 27, n. 223, mar. 2019.
ISSN 2067-0427.
Available at: <http://annals.cmu-edu.eu/index.php/cmuannals/article/view/45>. Date accessed: 04 mar. 2021.