@book{NASA.2006,
	title = {Next Generation Air Transportation System (NGATS) Air Traffic Management (ATM)-Airspace Project:  Reference Material},
	author = { NASA},
	institution = {NASA},
	year = {2006},
	biburl = {http://www.bibsonomy.org/bibtex/2e22e5740f59307d770848af37802c8e3/stephan_dlr},
	keywords = {imported }
}