ANGELOVA, Dora. Endodynamic determination and rearrangement of valley systems in Bulgaria at the Pliocene-Quaternary boundary . Geografia Fisica e Dinamica Quaternaria, [S. l.], v. 6, p. 19–24, 2003. Disponível em: https://www.gfdq.glaciologia.it/index.php/GFDQ/article/view/1250.. Acesso em: 27 jul. 2026.