1. Koike Y. (1992) Gradient Index Materials and Components. In Hornak L.A. (ed) Polymers for Lightwave and Integrated Optics. Marcel Dekker, Inc., New York.
2. Koike Y., Ishigure T., Horibe A., Nihei E. (1993) In ?Second International Conference on Plastic Optical Fibers and Applications?, The Hauge, June 28?29.
3. Ohtsuka, Y. (1973) Appl. Phys. Lett. 23: 247.
4. Ohtsuka Y., Nakamoto I. (1976) Appl. Phys. Lett. 29: 559.
5. Hamblen D.P. (1977) U. S. Patent 4, 022,855.