00861nam0-22003011i-450-99000084157040332120031023104333.00-12-656880-4000084157FED01000084157(Aleph)000084157FED0100008415720020821d1981----km-y0itay50------baitay-------001yyMaximum principles and their applicationsR.P. SperbNew YorkAcademic Press1981IX, 224 p.23 cmMathematics in science and engineering157515.353Sperb,René P.344495ITUNINARICAUNIMARCBK99000084157040332102 34 E 143680FINBNFINBNMaximum principles and their applications348107UNINA