T. Alymbaev A, Bapa Kyzy A, K. Sharshembieva F. PERIODIC SOLUTIONS OF A SECOND-ORDER NONLINEAR VOLTERRA INTEGRO-DIFFERENTIAL EQUATION. Adv. Differ. Equ. Control Process. [Internet]. 2024May14 [cited 2025Feb.10];31(2). Available from: https://ojs.acad-pub.com/index.php/ADECP/article/view/2438