SHAPIRO, B. Root Asymptotics for the Eigenfunctions of Univariate Differential Operators. Acta Polytechnica, [S. l.], v. 50, n. 5, 2010. DOI: 10.14311/1275. Disponível em: https://ojs.cvut.cz/ojs/index.php/ap/article/view/1275. Acesso em: 5 may. 2024.