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© 1986 Optical Society of America
B. J. Howell, "Patent Reviews: 4,569,591; 4,572,620; 4,572,623; 4,572,628; 4,572,665; 4,572,669; 4,572,958; 4,573,765; 4,573,767; 4,573,770; 4,575,192; 4,575,195; 4,575,198; 4,575,238; 4,576,443; 4,576,444; 4,576,445; 4,577,936; 4,578,804," Appl. Opt. 25, 2452-2626 (1986)
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