JASILIONIS, R. The existence of the solutions of the complex mathematical programming problem. Lithuanian Mathematical Journal, [S. l.], v. 7, n. 2, p. 339–347, 1967. DOI: 10.15388/LMJ.1967.19963. Disponível em: https://www.journals.vu.lt/LMJ/article/view/19963. Acesso em: 14 apr. 2025.