@conference {765,
	title = {Flexible Use and Understanding of Place Value Via Traditional and Digital Tools. Research Report.},
	booktitle = {Proceedings of the 38th Conference of the International Group for the Psychology of Mathematics Education and the 36th Conference of the North American Chapter of the Psychology of Mathematics Education},
	year = {2014},
	publisher = {Psychology of Mathematics Education (PME)},
	organization = {Psychology of Mathematics Education (PME)},
	address = {Vancouver, Canada},
	author = {Kortenkamp, Ulrich and Ladel, Silke},
	editor = {Lilijedahl, Peter and Nicol, Cynthia and Oesterle, Susan and Allan, Darien}
}
