1. J. Boussinesq, ‘‘Theorie des ondes et des remous qui se propagent le long d’un canal rectangulaire horizontal, en communiquant au liquide contenu dans ce canal des vitesses sensiblement pareilles de la surface au fond,’’ J. Math. Pures Appl., Deux. Ser. 17, 55–108 (1872).
2. J. Banasiak, N. A. Manakova, and G. A. Sviridyuk, ‘‘Positive solutions to Sobolev type equations with relatively p-sectorial operators,’’ Vestn. Yuzh.-Ural. Univ., Ser. Mat. Model. Program. 13 (2), 17–32 (2020).
3. N. N. Solovyova, S. A. Zagrebina, and G. A. Sviridyuk, ‘‘Sobolev type mathematical models with relatively positive operators in the sequence spaces,’’ Vestn. Yuzh.-Ural. Univ., Ser. Mat., Mekh., Fiz. 9 (4), 27–35 (2017).
4. A. G. Sveshnikov, A. B. Al’shin, M. O. Korpusov, and Yu. D. Pletner, Linear and Nonlinear Sobolev-Type Equations (Fizmatlit, Moscow, 2007) [in Russian].
5. T. K. Yuldashev, ‘‘Mixed differential equation of a Boussinesq type,’’ Vestn. Volgogr. Univ., Ser.: Mat. Fiz. 2 (33), 13–26 (2016).