[1] J. SATHER:
The initial boundary value problem for a non-linear hyperbolic equation in relativistic quantum mechanics. Journal of Mathematics and Mechanics, Vol. 16, 1 (1966), 27-50.
MR 0196301 |
Zbl 0141.28803
[2] J. L. LIONS:
Équations différentielles opérationnelles et problèmes aux limites. Springer - Verlag, Berlin, 1961.
MR 0153974 |
Zbl 0098.31101
[3] G. PROUSE:
Soluzioni periodiche dell equazione delle ondo non omogenea con termine dissipativo quadratico. Richerche di Matematica, XIII, 2 (1964), 261-280.
MR 0194753
[4] A. FRIEDMAN:
Partial differential equation of parabolic type. Englewood Cliffs, Prentice-Hall, 1964.
MR 0181836
[5] E. HILLE R. S. PHILLIPS:
Functional analysis and semi-groups. American Mathematical Society, 1957.
MR 0089373