YURKO, V. A. Recovering differential pencils on graphs with a cycle from spectra. Tamkang Journal of Mathematics, [S. l.], v. 45, n. 2, p. 195–206, 2014. DOI: 10.5556/j.tkjm.45.2014.1492. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/1492. Acesso em: 29 apr. 2024.