1. Babich, V.M., Kapilevich, M.B., Mikhlin, S.G., Natanson, G.I., Riz, P.M., Slobodetskii, L.N., and
Smirnov, M.M., Lineinye uravneniya matematicheskoi
fiziki (Linear Equations of Mathematical Physics), Moscow:
Nauka, 1964.
2. Gel’fand, I.M., Some questions of analysis and differential equations,
Usp. Mat. Nauk, 1959, vol. 14, no. 3,
pp. 3–19.
3. Tikhonov, A.N. and Samarskii, A.A., Uravneniya matematicheskoi
fiziki (Equations of Mathematical Physics), Moscow, 1953.
4. Leibenzon, L.L., Dvizhenie prirodnykh zhidkostei i gazov v poristoi
srede (Movement of Natural Liquids and Gases in Porous Media),
Moscow–Leningrad: OGIZ GITTL, 1947.
5. Zolina, L.A., On a boundary value problem for a model equation of
hyperbolo-parabolic type, USSR Comput. Math. Math.
Phys., 1966, vol. 6, no. 6, pp. 63–78.