VENKATESH, S.; BALASUBRAMANIAN, K. Some Results on Generating Graceful Trees. International Journal of Engineering & Technology, [S. l.], v. 7, n. 4.10, p. 570–572, 2018. DOI: 10.14419/ijet.v7i4.10.21283. Disponível em: https://sciencepubco.com/index.php/ijet/article/view/21283.. Acesso em: 22 dec. 2024.