00663nam0-22002651i-450-99000050232040332120001010000050232FED01000050232(Aleph)000050232FED0100005023220001010d--------km-y0itay50------baitay-------001yyGradient indey opticsErich W. Mar chandN.Y.Academic Press1978Marchand,Erich W.ITUNINARICAUNIMARCBK99000050232040332110 B III 154CNR L/11DINELDINELUNINAING01