00458nam a2200169Ia 4500082002000000100001800020245003700038260003000075300002100105500000500126690000600131700000500137952010200142964001700244921001000261999001700271  a515.35bC785.PD  aCopson, E. T.  aPartial differential equationsb  aNew DelhibS. Chandc1976  avii, 280p. Index  a  a   a  00104070aISIbISId1998-09-23l0o515.35 C785.PDpDP15776r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a13421  c13421d13421