This paper gives an overview of most of the popular teachers of Janas.

http://www.leighb.com/Jhana_in_Theravada_Quli.pdf 

Thanks, very interesting.

I came across a scholarly treatment of the jhanas by a Polish buddhiologist:


https://www.amazon.com/Reexamining-Jhana-Critical-Reconstruction-Soteriology/dp/8322732600/ref=la_B00JIKENU6_1_1?s=books&ie=UTF8&qid=1510463716&sr=1-1

You can download it for free at the web of his university:


http://www.umcs.pl/en/addres-book-employee,2226,en.html

Interesting paper. Thanks for sharing.