@book{12019,
	author = {Ackermann, Thomas.},
	title = {Wind power in power systems },
	publisher = {Wiley,},
	year = {2012.},
	address = {Chichester, West Sussex ;},
	edition = {2nd ed.},
	url = {http://catalogimages.wiley.com/images/db/jimages/9780470974162.jpg}
}