@book{188252,
	author = {Skrebowski, Chris},
	title = {Gas production grows a little as oil production slides},
	year = {mayo 2013},
	note = {In 2012, oil production by the main quoted companies fell by over 200,000 b/d, continuing the decline seen every year since 2006. Meanwhile, gas production reached record output levels despite declines for some of the largest companies,reports Chris Skrebowski.}
}