Skučaitė A, Skučaitė-Bingelė K, Pečiulytė S, Štikonas A. Investigation of the spectrum for the Sturm–Liouville problem with one integral boundary condition. NAMC [Internet]. 2010 Oct. 25 [cited 2025 Jul. 8];15(4):501-12. Available from: https://www.zurnalai.vu.lt/nonlinear-analysis/article/view/14321