[1]
L. P. Nizhnik and S. Albeverio, “Schrödinger operators with nonlocal potentials”, MFAT, vol. 19, no. 3, pp. 199–210, Sep. 2013, Accessed: Dec. 16, 2025. [Online]. Available: https://zen.imath.kiev.ua/index.php/mfat/article/view/548