AHMED, Mamoon; MOH’D, Fida. THE HECKE ALGEBRA \(H(P_{\mathbb{Q}}, P_{\mathbb{Z}})\) AND ITS RELATION TO THE CROSSED PRODUCT \(H(P_{\mathbb{Q}}^{+}, P_{\mathbb{Z}})\) \(\times_{β}\) {1, −1}. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 39, p. 569–578, 2018. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6882. Acesso em: 26 sep. 2026.