Mykytyuk, Y.V., Hryniv, R.O. and Albeverio, S. (2007) “Inverse spectral problems for coupled oscillating systems: reconstruction from three spectra”, Methods of Functional Analysis and Topology, 13(2), pp. 110–123. Available at: https://zen.imath.kiev.ua/index.php/mfat/article/view/343 (Accessed: 16 December 2025).