For those that are interested in Janus and WebRTC in general, I highly recommend reading Lorenzo Miniero's (creator of Janus) Ph.D thesis [1] on the project and the state-of-the-art of WebRTC. It's brilliant and enlightening. The Janus project is a really marvel of engineering.
I didn't know anyone else apart from me and and my tutor had read my Ph.D Thesis... :-) Glad you found it informative! Janus was indeed born during my research efforts there.
[1] http://www.fedoa.unina.it/10403/1/miniero_lorenzo_27.pdf (PDF)