[1] A. S. Husain-Abidi, US Patent 213558

[2] A. S Husain-Abidi, US Patent 277541

[3] A. S. Husain-Abidi, US Patent 360529

[4] P. C. Mchta et al., Appl. Opt., 16(2), 445(1977)

[5] A. Offer, US Patent 3748015

[6] A. Suzuki, US Patent 4167677

[7] A. Suzuki, Appl. Opt., 2(24), 3943(1983)

[8] A. Suzuki, Appl. Opt., 22(24), H950(1983)

[9] С. S. Ih et al., Appl. Opt., 19(24), 4196 (1980)

[10] B. I. Specktor, World Patent Acc No. 85-060730/ 10

[11] В. I. Spoltor, World Patent Acc No. 85-140073/23