00362nam a2200133Ia 450000100060000000300040000600500170001000800410002704000110006804100080007908200190008710000240010624500980013028750Ost20260507160248.0251113s9999||||xx |||||||||||||| ||eng||  cnitttr  aeng  a621.319bB63U   aBollen,  Math H. J. 0aUnderstanding power quality problems :b Voltage sags and interruptions /cBollen, Math H. J.