Elevated airport. Austin, S. G February 2007.
Elevated airport [link]Paper  bibtex   
@patent{austin_elevated_2007,
	title = {Elevated airport},
	url = {http://www.ipo.gov.uk/p-ipsum/Case/PublicationNumber/GB2428700},
	nationality = {Grande-Bretagne},
	language = {en},
	number = {GB 2 428 700 A},
	urldate = {2015-02-06},
	author = {Austin, Stanley G},
	collaborator = {{Franks \& Co Limited}},
	month = feb,
	year = {2007}
}

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