1.
Karpenko OV, Kravets VI, Stanzhitskii AN. Oscillation of solutions of the second-order linear functional-difference equations. Ukr. Mat. Zhurn. [Internet]. 2013Feb.25 [cited 2023Feb.9];65(2):226-35. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/2414