1. The Wide-area Energy Storage and Management System – Battery Storage Evaluation;Lu,2009
2. The Role of Energy Storage With Renewable Electricity Generation;Denholm,2010
3. Variability of Wind Power and Other Renewables: Management Options and Strategies,2005
4. “Electricity energy storage technology options”. A White Paper Primer on Applications, Costs and Benefits 1020676 Final Report, December 2010.