KARSAVINAS, Levas. On Perfection. Problemos, [S. l.], v. 46, p. 120–143, 1994. DOI: 10.15388/Problemos.1994.46.7059. Disponível em: https://journals.vu.lt./problemos/article/view/7059. Acesso em: 27 apr. 2025.