Hi, I recommend this following research: http://www.cs.cmu.edu/~nasmith/LS2/das-martins.07.pdf http://www.aclweb.org/anthology-new/W/W03/W03-1204.pdf

I still have other papers, but those can be a good starting point.

In my thesis, NLP is done via statistical approach. It learns from it's previous summaries does have somewhat learning. I don't see any problems combining NLP with Machine Learning. Can you elaborate on this?