Looking Under the Hood : Tools for Diagnosing your Question Answering Engine - Eric Breck; Marc Light; Gideon S. Mann; Ellen Riloff; Brianne Brown; Pranav Anand; Mats Rooth; Michael Thelen (CoRR, 2001)

A Bootstrapping Method for Learning Semantic Lexicons using Extraction Pattern Contexts. - Michael Thelen; Ellen Riloff (EMNLP, 2002)