C. Candelise, R. Gross, and M. Leach. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 224 (2):
153--166(Mar 1, 2010)
M. Ibrohimovna, and S. de Groot. Mobile Ubiquitous Computing, Systems, Services and Technologies, 2009. UBICOMM '09. Third International Conference on, page 311-317. (October 2009)