R. JANANI; T. RAMACHANDRAN. Median vertex vague labeling of vague graphs. Malaya Journal of Matematik, India, v. 9, n. 01, p. 805–809, 2021. Disponível em: https://www.malayajournal.org/index.php/mjm/article/view/1161. Acesso em: 15 apr. 2025.