N. Jeffs, A. Blant, T. Cheng, C. Foxon, C. Bailey, P. Harrison, J. Mosselmans, и A. Dent. Wide-Bandgap Semiconductors for High Power, High Frequency and High Temperature: Symposium Held April 13-15, 1998, San Francisco, California, U.S.A (Materials Research Society Symposium Proceedings), 512, стр. 519. Materials Research Society, (1998)