00718nam0-22002651i-450-99000083342040332120001010000083342FED01000083342(Aleph)000083342FED0100008334220001010d--------km-y0itay50------baitay-------001yyDifferential operators of mathematical physicsLondonAddison-WesleyHellwig,Gunter40782ITUNINARICAUNIMARCBK99000083342040332102 65 D 151536FINBNFINBNDifferential operators of mathematical physics348331UNINAING01