%0 Journal Article %T Gradient‐Index polymer materials and their optical devices %A Koike, Yasuhiro %A Tanio, Norihisa %A Nihei, Eisuke %A Ohtsuka, Yasuji %J Polymer Engineering & Science %V 29 %N 17 %P 1200-1204 %@ 0032-3888 %D 1989-09-01 %I Wiley Subscription Services, Inc., A Wiley Company %~ DeepDyve