1. J.R. Vig, A. Ballato, in E.P. Papadakis (Ed.), Ultrasonic Instruments and Devices, Academic Press, 1999 (Chapter 7).
2. IEEE Std. 802.15.1; IEEE Std. 802.15.4.
3. Fundamental limits of the frequency stabilities of crystal oscillators;Walls;IEEE Trans. Ultrason. Ferroelect. Freq. Contr.,1995
4. D. Salt, Handbook of Quartz Crystal Devices, Van Nostrand Reinhold, Wokingham, UK, 1987.
5. B. Razavi, RF Microlectronics, Prentice Hall, USA, 1998, p. 214.