1. E. Yablonovitch, Phys. Rev. Lett. 58(20), 2059 (1987).
2. S. John, Phys. Rev. Lett. 58(23), 2486 (1987).
3. K. Busch and S. John, Phys. Rev. E 58(3), 3896 (1998).
4. Confined Electrons and Photons. New Physics and Applications, Ed. by E. Burstein and C. Weisbuch (Plenum, New York, 1995); J. D. Joannopoulos, R. D. Meade, and J. D. Winn, Photonic Crystals (Princeton Univ. Press, Princeton, N.J., 1995).
5. E. Yablonovitch, J. Phys.: Condens. Matter 5, 2443 (1993).