J. Matsuoka, T. Sato and T. Ohshima, “600MHz Crystal Oscillator Circuit Realizing the High Negative Resistance and Low Drive Level, ”IEEJ EM Symposium, pp. 45-48, 2003.
C. Chang, K. Saeki, and Y. Sekine, “A Colpitts-type Crystal Oscillator with a Common-base Circuit for gigahertz frequency band, ” IEE Japan, AVLSIWS, 37. France, Oct.2005.