Budochkina, Svetlana, and Hue Phuong Vu. “On an Indirect Representation of Evolutionary Equations in the Form of Birkhoff’s Equations”. Eurasian Mathematical Journal 13, no. 3 (September 30, 2022): 23–32. Accessed January 19, 2026. https://emj.enu.kz/index.php/main/article/view/261.