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@article{xqueryfrag-is,
	author          = {Jan Hidders and Stefania Marrara and Jan Paredaens and Roel Vercammen},
	title           = {On the expressibility of functions in XQuery fragments},
	journal         = {Information Systems},
	year            = {2008},
	volume          = {33},
	number          = {4-5},
	pages           = {435--455},
	url             = {http://www.bibsonomy.org/documents/08c1847dfbb376cb7d8c7a7b912b7c5c/hidders/xqueryfrag-is.pdf?action=download}
}