@book{355679,
	author = {Blackburn, J. Lewis,},
	title = {Symmetrical components for power systems engineering /},
	publisher = {M. Dekker,},
	year = {c1993.},
	address = {New York :},
	url = {http://www.loc.gov/catdir/enhancements/fy0647/93001188-d.html}
}