YURKO, Vjacheslav A. Recovering Higher-order Differential Operators on Star-type Graphs from Spectra. CUBO, A Mathematical Journal, [S. l.], v. 10, n. 1, p. 93–102, 2008. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/1528. Acesso em: 7 dec. 2025.