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© 1983 Optical Society of America
B. J. Howell, "Patents Reviews: 4,370,033; 4,373,780; 4,374,612; 4,375,312; 4,375,686; 4,375,689; 4,376,307; 4,376,568; 4,376,570; 4,376,571; 4,376,580; 4,377,326; 4,376,582; 4,376,950; 4,378,599; 4,377,325; 4,378,600," Appl. Opt. 22, 2236-2238 (1983)
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