TY - CONF AU - Romaus, C. AU - Bocker, J. AU - Witting, K. AU - Seifried, A. AU - Znamenshchykov, O. ID - 16661 SN - 9781424428939 T2 - 2009 IEEE Energy Conversion Congress and Exposition TI - Optimal energy management for a hybrid energy storage system combining batteries and double layer capacitors ER -