@book{175110,
	author = {Probert, Tim},
	title = {Pnu tricks: compressed air energy storage},
	year = {sep. 2009},
	note = {PEi visits the headquarters of Energetix, a UK firm specializing in low cost energy efficiency products, to find out more about Pnu Power – a pneumatic battery that is set to challenge lead acid batteries as the energy storage medium of choice for uninterruptible power supplies for high ambient temperatures.}
}