00327nam a2200121Ia 4500082002100000100002100021245006300042260002500105300002100130490004400151500000500195700000500200  a515.35bSh559.HS  aShowalter, R. E.  aHilbert space methods for partial differential equationsb  aLondonbPitmanc1977  axii, 196p. Index  aMonograph and studies in Mathematics, 1  a  a