Courant, R. And Hilbert, D.
Methods Of Mathematical Physics Vol 2: Partial Differential Equations - 0 - Weinheim Wiley-Vch Verlag 2002 - ,;ill.
0-471-50439-4
Methods Of Mathematical Physics Vol 2: Partial Differential Equations - 0 - Weinheim Wiley-Vch Verlag 2002 - ,;ill.
0-471-50439-4