00339nam a2200121Ia 4500082002000000100003200020245007200052260003400124300001000158490003900168500000500207700000500212  a515.72bF951.SA  aFucik, Svatopluk and Others  aSpectral analysis of nonlinear operatorsbcBy Svatopluk and others  aBerlinbSpringer-Verlagc1973  a287p.  aLecture notes in Mathematicsv 346  a  a