KHRABUSTOVSKII , A. .; ZNOJIL , M. Analytic and Algebraic Methods in Physics. Acta Polytechnica, [S. l.], v. 62, n. 1, 2022. Disponível em: https://ojs.cvut.cz/ojs/index.php/ap/article/view/7953. Acesso em: 2 may. 2024.