@conference {pirooz2011small,
	title = {Small Signal Stability Improvement of AC Transmission Networks Using HVDC Grid},
	booktitle = {CIGRE Int. Symp. Electric Power Syst. Future-Integrating Supergrids and Microgrid, Date: 2011/09/01-2011/09/01, Location: Bologna, Italy},
	year = {2011},
	author = {Pirooz Azad, Sahar and Iravani, Reza and Tate, Joseph}
}