FREILING, G.; YURKO, V. A. Inverse nodal problems for differential operators on graphs with a cycle. Tamkang Journal of Mathematics, [S. l.], v. 41, n. 1, p. 15–24, 2010. DOI: 10.5556/j.tkjm.41.2010.634. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/634. Acesso em: 29 apr. 2024.