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B. J. Howell, "Patent Reviews: 4,158,151; 4,159,443; 4,160,579; 4,160,931; 4,164,365; 4,164,658; 4,165,155; 4,166,669; 4,168,107; 4,170,771; 4,170,772; 4,172,630; 4,179,184; 4,203,326; 4,206,979; 4,211,468; 4,214,819; 4,215,263; 4,217,036; 4,225,211; 4,233,569; 4,233,570; 4,233,571; 4,233,572; 4,234,856; 4,236,640; 4,239,342; 4,243,293; 4,245,157; 4,247,160; 4,255,364; 4,259,014; 4,260,217; 4,261,645; 4,262,198; 4,249,204; 4,264,141; 4,265,543; 4,268,128; 4,269,477; 4,269,478; 4,270,843; 4,270,848; 4,272,152; 4,273,415," Appl. Opt. 20, A183-A192 (1981)
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