KAMAKU, Waweru; MUTEMBEI, Josephine; KIVUNGE, Benard. Positive P 0,1 Matrix Completion Problem for Order Four Digraphs with Zero, One, Two and Three Arcs. International Journal of Sciences: Basic and Applied Research (IJSBAR), Jordan, v. 34, n. 3, p. 22–30, 2017. Disponível em: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/7671. Acesso em: 11 sep. 2025.