KISELEV, A. V.; ERSHOVA, Yu. Trace formulae for Schrödinger operators on metric graphs with applications to recovering matching conditions. Methods of Functional Analysis and Topology, [S. l.], v. 20, n. 2, p. 134–148, 2014. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/574. Acesso em: 15 dec. 2025.