Prasad, Phoolan. Partial differential equations / by Phoolan Prasad ; Renuka Ravindran. - Reprinted 1987 / - New Delhi-2 : Wiley Eastern Ltd. , 1985 - p.252,xi : ISBN: 0-85226-722-3 Subjects--Topical Terms: Mathematics Dewey Class. No.: B334 / M5;4