S. Bader, P. Hitzler, S. Hölldobler, and A. Witzel. Proceedings of the Twentieth International Joint Conference on Artificial Intelligence, page 666--671. Hyderabad, AAAI Press, (January 2007)
P. Werbos. volume 50 of Lecture Notes in Computational Science and Engineering, chapter Backwards Differentiation in AD and Neural Nets: Past Links and New Opportunities, page 15--34. Springer, (2006)
L. Spector, J. Klein, and M. Feinstein. GECCO 2007: Proceedings of the Genetic and Evolutionary Computation Conference, page 316--323. London, UK, ACM Press, (2007)