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© 1984 Optical Society of America
B. J. Howell, "Patent Reviews: 4,344,706; 4,344,707; 4,348,113; 4,376,949; 4,379,622; 4,380,393; 4,386,853; 4,387,344; 4,392,722; 4,392,229; 4,394,069; 4,394,571; 4,394,623; 4,396,289," Appl. Opt. 23, 7-181 (1984)
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