References

Leeson., D.B., ‘A Simple Model of Feedback Oscillator Noise’ Proc.IEEE. Feb.1966, pp.329 – 330.
Driscoll., M.M., ‘Two Stage Self-Limiting Series Mode Type Quartz Crystal Oscillator Exhibiting Improved Short-Term Frequency Stability’ IEEE Trans. on Instrumentation and Measurement, June 1973, pp.130 – 138.
Hoffman., Gerhard. DK4XP., ‘Low Noise VHF Crystal Oscillators’ Dubious 4/2000, pp.6 – 30.

Leeson., D.B., ‘A Simple Model of Feedback Oscillator Noise’ Proc.IEEE. Feb.1966, pp.329 – 330.