Nontrivial Deformation of Vec(R)-Modules of Symbols. Journal of Prime Research in Mathematics, [S. l.], v. 22, n. 1, p. 76–84, 2026. Disponível em: https://jprm.sms.edu.pk/index.php/jprm/article/view/323. Acesso em: 15 feb. 2026.