Molyboga VM. Estimates for periodic eigenvalues of the differential operator $(-1)^md^2m/dx^2m+V$ with $V$-distribution. MFAT [Internet]. 2003 Jun. 25 [cited 2025 Dec. 17];9(2):163-78. Available from: https://zen.imath.kiev.ua/index.php/mfat/article/view/212