DUNNE, G. V. Functional Determinants for Radially Separable Partial Differential Operators. Acta Polytechnica, Prague, Czech Republic, v. 47, n. 2-3, 2007. DOI: 10.14311/916. Disponível em: https://ojs.cvut.cz/ojs/index.php/ap/article/view/916. Acesso em: 22 jan. 2025.