@article{kortenkamp_flexible_2014,
	title = {Flexible {Use} and {Understanding} of {Place} {Value} via {Traditional} and {Digital} {Tools}. {Research} {Report}.},
	url = {http://www.pmena.org/proceedings/PMENA\%2036\%20PME\%2038\%202014\%20Proceedings\%20Vol\%204.pdf},
	journal = {Proceedings of the 38th Conference of the International Group for the Psychology of Mathematics Education (PME-38) and the 36th Conference of the North American Chapter of the Psychology of Mathematics Education (PME-NA-36) - Volume 4},
	author = {Kortenkamp, Ulrich and Ladel, Silke},
	editor = {Liljedahl, Peter and Nicol, Cynthia and Oesterle, Susan and Allan, Darien},
	year = {2014},
	note = {Place: Vancouver, Canada
Publisher: Psychology of Mathematics Education (PME)},
	pages = {33--40},
}

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