Ahmed, M., & Moh’d, F. (2018). 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, 39, 569–578. Retrieved from https://journals.uniurb.it/index.php/ijpam/article/view/6882