HAMEED HASSAN, T.; MOHAMMAD ABBAS, R. Prime Graceful Labeling. International Journal of Engineering & Technology, [S. l.], v. 7, n. 4.36, p. 750–752, 2018. DOI: 10.14419/ijet.v7i4.36.24234. Disponível em: https://www.sciencepubco.com/index.php/ijet/article/view/24234.. Acesso em: 27 apr. 2024.