Myint-U T. Partial Differential Equations of Mathematical Physics

Second Edition. — Elsevier North Holland Inc., 1982. — 396 p. — ISBN: 0-444-00352-5.Mathematical Models.
Classification of Second-order Equations.
The Cauchy Problem.
Fourier Series.
Method of Separation of Variables.
Eigenvalue problems.
Boundary Value Problems.
Higher Dimensional Problems.
Green's Function.
Integral Transforms.
Appendix.