1. A. G. Sveshnikov, A. V. Al’shin, M. O. Korpusov, and Yu. D. Pletner, Linear and Nonlinear Sobolev-Type Equations (Fizmatlit, Moscow, 2007) [in Russian].
2. G. I. Barenblatt, V. M. Entov, and V. M. Ryzhik, Motion of Liquids and Gases in Natural Rocks (Nedra, Moscow, 1984) [in Russian].
3. M. Kh. Shkhanukov, “Some boundary value problems for a third-order equation that arise in the modeling of the filtration of a fluid in porous media,” Differ. Equations 18 (4), 509–517 (1982).
4. C. Cuesta, C. J. van Duijn, and J. Hulshof, “Infiltration in porous media with dynamic capillary pressure: travelling waves,” Eur. J. Appl. Math. 11 (4), 381–397 (2000). https://doi.org/10.1017/S0956792599004210
5. A. F. Chudnovskii, Soil Thermophysics (Nauka, Moscow, 1976) [in Russian].