GomilkoA. M. and PivovarchikV. N. (2008) “Inverse Sturm-Liouville problem on a figure-eight graph”, Ukrains’kyi Matematychnyi Zhurnal, 60(9), pp. 1168–1188. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3235 (Accessed: 23November2024).