Nizhnik, L. P., and V. I. Rabanovich. “On New Inverse Spectral Problems for Weighted Graphs”. Methods of Functional Analysis and Topology 23, no. 1 (March 25, 2017): 66–75. Accessed December 16, 2025. https://zen.imath.kiev.ua/index.php/mfat/article/view/655.