EM theremin working

Hi,
I need to give a presentation about working of the EM therein as a part of my college project. Can anyone guide me to good resources where I can understand the circuit design of the oscillators and other components in depth. I do have a broad idea but I want to know more and in lot more depth.
Thanks!

Thierry has some math regarding the sizing of the pitch EQ coil, Moog Inc. has a document on hotrodding the EW, and Bob Moog has written several articles on his various designs.  Other than that and pawing through the TW forum archives, you're kind of on your own.  

Someone seriously needs to write a book.