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://journals.vu.lt./LMJ/article/view/20757. Acesso em: 26 apr. 2025.