1. Fuel Cell Industry Review 2013,2013
2. Hydrogen Program – Early Markets: Fuel Cells for Backup Power;DOE,2009
3. Annual Conference and Expo: Fuel Cells for Critical Communications Backup Power;APCO,2009
4. Backup Power Cost of Ownership Analysis and Incumbent Technology Comparison, NREL/TP-5400-60732;Kurtz,2014
5. Warid Pakistan Expects to Save More than US$ 6 Million per Year After Trialling Energy Efficiency Solutions, Mobile Energy Efficiency Optimization Case Study,2014