Michael Palij, The Ukrainian-Polish Defensive Alliance, 1919-1921. Zeitschrift für Ostmitteleuropa-Forschung, [S. l.], v. 47, n. 1, p. 105–106, 1998. DOI: 10.25627/19984716507. Disponível em: https://openjournals.osmikon.de/zfo/article/view/6507. Acesso em: 16 sep. 2026.