[1] Hordvik A.Appl Opt,1977;16(11):2827
[2] Hutchinson C J,Lewis C,Savage J A et al.Appl Opt,1982;21(8):1450
[3] Rosenstock H B,Hass M,Gregory D A et al.Appl Opt,1977;16(11):2837
[4] Harrington J A,Braunstein M,Rudisill J E.Appl Opt,1977;16(11):2843
[5] Gibbs W E K,Butterfield A W.Appl Opt,1975;14(12):3042
[6] At kinson R1Appl Opt,1985;24(4):465