PENTEK, Z. On Empresses of the Latin Empire (1204–1261). Agnes of Montferrat (Maria?), the unknown daughter of Tsar Kaloyan. Balcanica Posnaniensia. Acta et studia, [S. l.], v. 28, n. 2, p. 31–40, 2021. DOI: 10.14746/bp.2021.28.18. Disponível em: https://pressto.amu.edu.pl/index.php/bp/article/view/29380. Acesso em: 5 feb. 2023.