V. J. KANERIA; M. M. JARIYA; H. M. MAKADIA. Graceful labeling of arrow graphs and double arrow graphs. Malaya Journal of Matematik, India, v. 3, n. 04, p. 382–386, 2015. DOI: 10.26637/mjm304/002. Disponível em: https://www.malayajournal.org/index.php/mjm/article/view/487. Acesso em: 16 jul. 2024.