1. E. Yablonovitch, Phys. Rev. Lett. 58, 2059 (1987).
2. S. John, Phys. Rev. Lett. 58, 2486 (1987).
3. J. D. Joannopoulos, R. D. Meade, and J. N. Winn, Photonic Crystals: Molding the Flow of Light (Princeton University Press, Princeton, New Jersey, United States, 1995).
4. V. P. Bykov, Kvantovaya Elektron. (Moscow) 1(7), 1557 (1975) [Sov. J. Quantum Electron. 4 (7), 861 (1975)].
5. E. P. Petrov, V. N. Bogomolov, I. I. Kalosha, and S. V. Gaponenko, Phys. Rev. Lett. 81, 77 (1998).