J. Klavans, M. Chodorow, and N. Wacholder. Natural Language Processing, volume 196 of The Kluwer International Series in Engineering and Computer Science, Kluwer / Springer, (1993)
Y. Liu, and N. Wacholder. Proceedings of the 2nd International Workshop on Contextual Information Access, Seeking and Retrieval Evaluation (CIRSE 2010), (2010)