00683nam0-22002651i-450-99000084385040332120001010000084385FED01000084385(Aleph)000084385FED0100008438520001010d--------km-y0itay50------baitay-------001yyPartial differential equationsLondonPitman1977.Colton,David L.28297ITUNINARICAUNIMARCBK99000084385040332102 32 E 52457FINBNFINBNPartial differential equations348787UNINAING01