00771nam0-22002891i-450-99000087749040332120001010000087749FED01000087749(Aleph)000087749FED0100008774920001010d--------km-y0itay50------baitay-------001yyEquations of the Mixed TypeNew YorkPergamon Press1964p.160ill.cm 20MatematicaBitsadze,Andrei Vasil'evich<1916- >13769ITUNINARICAUNIMARCBK99000087749040332103 M.0,1632649IINTCIINTCEquations of the mixed type345231UNINAING01