J. Ruth, and J. O'Regan. Proceedings of the Second International Workshop on Free/Open-Source Rule-Based Machine Translation, 2nd, page 69--76. Barcelona, Spain, Universitat Oberta de Catalunya, (January 2011)
W. Langdon. Genetic Programming 1996: Proceedings of the First
Annual Conference, page 141--148. Stanford University, CA, USA, MIT Press, (28--31 July 1996)
D. Flejter, K. Wieloch, and W. Abramowicz. Proceedings of the Workshop on Balto-Slavonic Natural Language Processing, page 51--58. Prague, Czech Republic, Association for Computational Linguistics, (June 2007)