V. Spitkovsky, H. Alshawi, and D. Jurafsky. NIPS 2009 Workshop on Grammar Induction, Representation of Language and Language Learning, Whistler, Canada, (December 2009)
P. Lichodzijewski, and M. Heywood. GECCO '07: Proceedings of the 9th annual conference on
Genetic and evolutionary computation, 1, page 464--471. London, ACM Press, (7-11 July 2007)