@book{941,
	author = {Gupta, B. R. and Singhal, Vandana.},
	title = {Power System Operation and Control},
	publisher = {S Chand & Co Ltd,},
	year = {2010.},
	address = {New  Delhi.},
	url = {http://www.amazon.com/exec/obidos/ASIN/8121932327/chopaconline-20}
}