Georgiev, S. G., et al. “Existence of Classical Solutions for Initial Boundary Value Problems for Nonlinear Dispersive Equations of Odd-Orders”. Methods of Functional Analysis and Topology, vol. 28, no. 3, Sept. 2022, pp. 228-41, https://doi.org/https://doi.org/10.31392/MFAT-npu26_3.2022.03.