1. L. V. Ovsyannikov, “Group properties of nonlinear heat-conduction equations,” Dokl. Akad. Nauk SSSR, 125, No. 3, 492–495 (1959).
2. A. D. Polyanin and V. F. Zaitsev, Handbook of Nonlinear Partial Differential Equations, Chapman & Hall/CRC, Boca Raton (2004).
3. Ya. B. Zeldovich and A. S. Kompaneets, “On the theory of propagation of heat for the temperature-dependent heat conduction,” in: Collection of Works Dedicated to the 70th Birthday of A. F. Ioffe [in Russian], Izv. Akad. Nauk SSSR (1950), pp. 61–71.
4. G. I. Barenblat, “On some unsteady motions of liquid and gas in porous media,” Prikl. Mat. Mekh., 16, No. 1, 67–78 (1952).
5. A. A. Samarskii, V. A. Galaktionov, S. P. Kurdyumov, and A. P. Mikhailov, Modes with Peaking in Problems for Quasilinear Parabolic Equations [in Russian], Nauka, Moscow (1987).