1. Motor vehicles and the environment;Walsh;Int. Conf. Automotive Industry and the Environment, Geneva, Switzerland,1990
2. US research and development program on fuel cells for transportation applications;Patil;Proc. 10th Int. Electric Vehicle Symp. (EVS-10), HongKong,361990
3. An assessment and comparison of fuel cells for transportation applications;Krumpelt,1989
4. Research and development of a fuel cell/battery powered bus system: Phase I;Final Tech. Rep., DOE/CH/10714-01,1990