how Q factor of resonator can stabilize an oscillator

I wanted to know that in Microwave oscillators like reflex klystrons or others.How does the Q factor of cavity resonators used in oscillators are used to change the stability of oscillator.

Is there any analytical relation,article or book explaining that.

Ah, you seek Mr Kurokawa

is he a member on this forum

---------- Post added at 05:32 ---------- Previous post was at 05:26 ----------

ok so now I know.but which book of kurokawa should I read

http://perlnet.umaine.edu/imt/DHM-en...DHM-energy.doc

IEEE Xplore - An X-band 10-watt multiple-IMPATT oscillator