Software

Implementations in both R and Python are available at:
https://github.com/slanglab/phrasemachine

Paper

The method is described in:

Slides for a presentation at the New Directions in Text as Data conference, October 2016.

Paper:
Bag of what? Simple noun phrase extraction for corpus analysis.
Abram Handler, Matt Denny, Hanna Wallach, and Brendan O'Connor.
NLP+CSS Workshop at EMNLP 2016.