Bollen, H.J. Understanding Power Quality Problems : Voltage Sags and Interruptions - 1st Ed. - New Delhi Wiley India Pvt. Ltd. 2014 - xi, 541p. 24 cm. Text in English ISBN: 9788126530397 Subjects--Facted Index Terms: ELEC Index Terms--Genre/Form: D-14 Dewey Class. No.: 621.31 / BOL