1. Protonex announces commercial fuel cell power system for unmanned applications at AUVSI's unmanned systems North America 2012,2012
2. Hardware-in-the-loop simulation of fuel cell-based hybrid electrical UAV propulsion;Verstraete,2012
3. Environmentally friendly power sources for aerospace applications;Lapeña-Rey;J Power Sources,2008
4. AFRL/RZ fuel cell program;Reitz,2010
5. US unmanned aerial systems;Gertler,2012