LESZKA, Mirosław. Image of tsar Peter in the medieval Bulgarian sources. Balcanica Posnaniensia. Acta et studia, [S. l.], v. 24, p. 5–16, 2018. DOI: 10.14746/bp.2017.24.1. Disponível em: https://pressto.amu.edu.pl/index.php/bp/article/view/10243. Acesso em: 29 mar. 2024.