Molyboga, V.M. and Mikhailets, V.A. (2008) “One-dimensional Schrödinger operators with singular periodic potentials”, Methods of Functional Analysis and Topology, 14(2), pp. 184–200. Available at: https://zen.imath.kiev.ua/index.php/mfat/article/view/382 (Accessed: 17 December 2025).