YURKO, V. Recovering arbitrary order differential operators on noncompact star-type graphs. Methods of Functional Analysis and Topology, [S. l.], v. 18, n. 1, p. 90–100, 2012. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/507. Acesso em: 16 dec. 2025.