1. M.J. Wooder andJ.C. Daincy: Opt. Commun., vol. 63, p. 816 (1981).
2. P.D. Foote, T.P. Hall andL.M. Connors: Optics and Laser Technol., vol. 18, p. 39 (1986).
3. P. Yeh, A.E.T. Chiou andJ. Hong: Appl.Optics, vol. 27, p. 2093 (1988).
4. K. Tada, H. Nanba, Y. Kuhara, M. Tatsumi, S. Iguchi, Y. Hamasaki, Y. Nishiwaki, K. Tsuno: J. Chem. Soc. J.Chem. Ind.Chem., vol. 10, p. 1630 (1981).
5. H. Abe, S. Toyoda, Y. Kakizaki, Y. Osugi andY. Kozuka: J. Japan. Assoc. Crystal Crowth, vol.17, p. 60(1990).