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B. J. Howell, R. L. Appler, D. C. Harper, H. Miranda, D. L. Sullivan, R. Astheimer, R. L. Hilliard, C. F. Mooney, S. K. Tchejeyan, J. J. Ball, S. F. Jacobs, J. W. Nielsen, C. H. Tosswill, N. J. Berg, R. Kingslake, J. N. Packard, L. O. Vargady, L. S. Birks, D. J. Lovell, E. D. Pallk, W. Vaughan, W. W. Chow, M. Lurie, R. Prescott, P. Wakeling, G. W. Cleek, A. Mann, C. B. Rubinstein, J. F. Walkup, J. A. Decker, J. R. Meyer-Arendt, J. J. J. Staunton, and D. E. Williamson, "Patent Reviews: 3,989,890; 3,989,947; 3,994,435; 4,073,574; 4,150,320; 4,164,432; 4,165,913; 4,171,003; 4,165,917; 4,168,882; 4,175,391; 4,222,370; 4,206,494; 4,222,667; 4,225,240; 4,227,076; 4,225,236; 4,226,502; 4,227,769; 4,227,773; 4,228,437; 4,229,073," Appl. Opt. 20, A81-A83 (1981)
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