1. Kisielowski, Proc. 2nd Int. Symp. on Blue Laser and Light Emitting Diodes (Tokyo, Japan: Ohmsha Ltd., 1998), p. 321.
2. Nakamura and Fasol, The Blue Laser Diode (Berlin: Springer-Verlag, 1997).
3. Bremser, Protzmann, Wachtendorf, Schön, Schwambera, Schineller, Heuken, Woelk, Schmitz, and Jürgensen, Proc. 2nd Int. Symp. on Blue Laser and Light Emitting Diodes (Chiba, Japan: Ohmsha Ltd., 1998).
4. Ou, Lin, Pan, Shu, Chen, and Lee, Proc. 2nd Int. Symp. on Blue Laser and Light Emitting Diodes (Chiba, Japan: Ohmsha Ltd., 1998), p. 453.
5. Matsuoka, Yoshimoto, Sasaki, and Katsui, J. Electron. Mater. 21, 157 (1992).