RAO, K. C.; SINGARAVEL, T. M. Some transformations of type M. Tamkang Journal of Mathematics, [S. l.], v. 32, n. 1, p. 27–31, 2001. DOI: 10.5556/j.tkjm.32.2001.364. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/364. Acesso em: 3 may. 2024.