@conference {5772553,
	title = {Small Signal Stability Improvement of AC Transmission Networks Using HVDC Grid},
	booktitle = {CIGRE International Symposium Electric Power System Future-Integrating Supergrids and Microgrid},
	year = {2011},
	month = {September},
	pages = {1-6},
	author = {S. P. Azad and J. E. Tate and R. Iravani}
}