J. Van Greunen, and J. Rabaey. Proceedings of the 2nd ACM international conference on Wireless sensor networks and applications, page 11--19. New York, New York, USA, ACM, ACM Press, (2003)
N. Lathia, S. Hailes, and L. Capra. SAC '08: Proceedings of the 2008 ACM symposium on Applied computing, page 2000--2005. New York, NY, USA, ACM, (2008)