00860nam0-22003011i-450 99000130063040332120190403114644.0000130063FED01000130063(Aleph)000130063FED0100013006320000920d1967----km-y0itay50------baengDifferential operators of mathematical physicsG. HellwigReading [MA]Addison-Wesley1967VII, 296 p.23 cmAddison-Wesley series in mathematicsHellwig,Gunter40782ITUNINARICAUNIMARCBK99000130063040332121-H-97572MA102 65 D 151536FINBNFINBNMA1Differential operators of mathematical physics348331UNINAING01