Mutembei, Josephine, Benard Kivunge, and Waweru kamaku. 2016. “Positive Matrix Completion Problem for Digraphs of Order 3 With 4 and 5 Arcs”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 28 (3): 75-81. https://www.gssrr.org/JournalOfBasicAndApplied/article/view/5903.