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2. BCI, Chicago, USA. http://www.leadacidbatteryinfo.org/lead-acid-battery-recycling.htm.
3. Clean Energy;Dell,2004
4. Electric Energy Storage Technology Options. A Primer on applications, Costs & Benefits,2010
5. Remote-area power-supply (RAPS) systems and the valve-regulated lead–acid battery;Newnham,2004