K. Lilja, K. Laakso, and J. Palomki. Technology Management in the Energy Smart World (PICMET), 2011 Proceedings of PICMET '11:, page 1--10. IEEE, (August 2011)
T. Recio, and M. González-López. ISSAC '94: Proceedings of the 1994 International Symposium on Symbolic
and Algebraic Computation: July 20--22, 1994, Oxford, England, United
Kingdom, page 354--358. New York, NY 10036, USA, ACM Press, (1994)