References

Assanis, D., G. Delagrammatikas, R. Fellini, Z. Filipi and J. Liedtke et al., 1999. An optimization approach to hybrid electric propulsion system design. Mech. Struct. Mach., 27: 393-421.
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Ciccarelli, T. and R. Toossi, 2002. Assessment of hybrid configuration and control strategies in planning future metropolitan/urban transit systems. Final Report, California State University, pp: 1-63. http://www.metrans.org/research/final/00-06_Final.pdf.

Farrell, J.A., M.J. Barth and J.W. Heffel, 1998. Hydrogen-powered advanced hybrid-electric vehicles. Final Report, College of Engineering Center for Environmental Research and Technology University of California, pp: 1-101.

Merkle, M.A., 1997. Variable bus voltage modeling for series hybrid electric vehicle simulation Master Thesis, Virginia Polytechnic Institute and State University, Blacksburg, Virginia.