TOMNO, V.; NYAMWALA, F.; KAMAKU, W. The Wss P0 Matrix Completion Problem for Symmetric Patterns of Acyclic Digraphs of Order Four. International Journal of Sciences: Basic and Applied Research (IJSBAR), [S. l.], v. 37, n. 1, p. 112–121, 2018. Disponível em: https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/8591. Acesso em: 4 may. 2024.