@book{36511,
	author = {Jenkins, C. S.},
	title = {Grounding concepts : an empirical basis for arithmetical knowledge /},
	publisher = {Oxford University Press,},
	year = {2008.},
	address = {Oxford :},
	url = {http://dx.doi.org/10.1093/acprof:oso/9780199231577.001.0001}
}