1.
Yesbayev A, Ospanov M. The solvability conditions for the second order nonlinear differential equation with unbounded coefficients in L2(R). M [Internet]. 2021 Mar. 30 [cited 2025 Jul. 10];101(1):104-10. Available from: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/433