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2. E. Acosta, S. Rios, M. Oikawa and K. Iga: Proc. 5th Int. Microoptics Conference, Hiroshima, Japan, 1995, p. 164.
3. K. Iga, Y. Kokubun and M. Oikawa: Fundamentals of Microoptics (Academic Press Inc., Tokyo, 1984) Chap. 2, p. 8.
4. M. Oikawa: Doctoral Dissertation, Tokyo Institute of Technology, 1984.