In Rohde, Poddar, Böck: The Design of modern microwave oscillators for wireless applications,
there is a whole section on the noise of n coupled oscillators.
More math than I'm willing to digest unless someone pays me for that.
Methinks Rohde has also written sth. on self-locking in Microwave journal last year.
cheers, Gerhard
(who would like to couple 16 MTI-260 crystal ovens, but forced by a slooow PLL. The oscillators
are here, time is mising. More like locking the 16 pcs. to a 17th and wilkinson the outputs together.)