PAULAUSKAS, V. On the Reinforcement of the Liapunov Theorem. Lithuanian Mathematical Journal, [S. l.], v. 9, n. 2, p. 323–328, 1969. DOI: 10.15388/LMJ.1969.20757. Disponível em: https://www.journals.vu.lt/LMJ/article/view/20757.. Acesso em: 1 may. 2024.