BOUMENIR, Amin; TUAN, Vu Kim. Transmutations for Strings. Armenian Journal of Mathematics, Yerevan, Armenia, v. 1, n. 1, p. 29–43, 2008. Disponível em: http://test.armjmath.sci.am/index.php/ajm/article/view/9. Acesso em: 9 may. 2026.