RAGI PUTHAN VEETTIL; T.V. RAMAKRISHNAN. The open hub number of a graph. Malaya Journal of Matematik, India, v. 8, n. 04, p. 1375–1377, 2020. DOI: 10.26637/MJM0804/0006. Disponível em: https://www.malayajournal.org/index.php/mjm/article/view/1619. Acesso em: 16 jul. 2024.