MAZĖTIS, Edmundas; MELNIČENKO, Grigorijus. Necessary and sufficient conditions in theorems. Lietuvos matematikos rinkinys, [S. l.], v. 65, n. B, p. 34–44, 2024. DOI: 10.15388/LMD.2024.38089. Disponível em: https://journals.vu.lt./LMR/article/view/38089. Acesso em: 26 apr. 2025.