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2. P. Knabner and L. Angermann, Numerical Methods for Elliptic and Parabolic Partial Differential Equations (Springer, New York, 2003).
3. O. A. Ladyzhenskaya, V. A. Solonnikov, and N. N. Ural’tseva, Linear and Quasilinear Equations of Parabolic Type (Am. Math. Soc., Providence, R.I., 1968).
4. A. Friedman, Partial Differential Equations of Parabolic Type (Prentice Hall, Englewood Cliffs, N.J., 1964).
5. M. H. Protter and H. F. Weinberger, Maximum Principles in Differential Equations (Prentice-Hall, Englewood Cliffs, N.J., 1967).