[1]
V. M. Molyboga, “Estimates for periodic eigenvalues of the differential operator $(-1)^md^2m/dx^2m+V$ with $V$-distribution”, MFAT, vol. 9, no. 2, pp. 163–178, Jun. 2003, Accessed: Dec. 17, 2025. [Online]. Available: https://zen.imath.kiev.ua/index.php/mfat/article/view/212