ILIEV NINOV, P.; IVANOVA KARAGIOZOVA, T.; RANKOVA, M. DETERMINATION OF WATER RESOURCES IN RIVERS IN THE BULGARIAN BASINS OF THE LOWER DANUBE. Journal of the Geographical Institute “Jovan Cvijić” SASA, [S. l.], v. 67, n. 1, p. 11–25, 2017. DOI: 10.2298/IJGI1701011I. Disponível em: https://ojs.gi.sanu.ac.rs/index.php/zbornik/article/view/23. Acesso em: 6 dec. 2021.