Learning Phrasal Categories. - William P. Headden III; Eugene Charniak; Mark Johnson 001 (EMNLP, 2006)

Evaluating Unsupervised Part-of-Speech Tagging for Grammar Induction. - William P. Headden III; David McClosky; Eugene Charniak (COLING, 2008)

Improving Unsupervised Dependency Parsing with Richer Contexts and Smoothing. - William P. Headden III; Mark Johnson 001; David McClosky (HLT-NAACL, 2009)

Unsupervised Bayesian Lexicalized Dependency Grammar Induction. - William P. Headden III (2012)