SMIRNOV, Sergey. Existence of sign-changing solutions for a third-order boundary value problem with nonlocal conditions of integral type. Topological Methods in Nonlinear Analysis. Online. 23 September 2023. Vol. 62, no. 1, pp. 377 - 384. [Accessed 8 March 2026]. DOI 10.12775/TMNA.2022.074.