Samoilenko, A.M., Chuiko, S.M. and Nesmelova, O.V. 2020. Nonlinear boundary-value problems unsolved with respect to the derivative. Ukrains’kyi Matematychnyi Zhurnal. 72, 8 (Aug. 2020), 1106-1118. DOI:https://doi.org/10.37863/umzh.v72i8.5986.