Vackář, Jiri (December 1949). LC Oscillators and their Frequency Stability(PDF) (Report). Prague, Czechoslovakia: Tesla National Corporation. Tesla Technical Report. Archived from the original(PDF) on 2009-01-24. Retrieved 2008-12-20.
Vackář, Jiri (December 1949). LC Oscillators and their Frequency Stability(PDF) (Report). Prague, Czechoslovakia: Tesla National Corporation. Tesla Technical Report. Archived from the original(PDF) on 2009-01-24. Retrieved 2008-12-20.