@conference {670,
	title = {Early Mathematics Learning. Selected Papers of the POEM 2012 Conference},
	booktitle = {POEM},
	year = {2014},
	publisher = {Springer},
	organization = {Springer},
	author = {Benz, C. and Brandt, B. and Kortenkamp, U. and Krummheuer, G. and Ladel, S. and Vogel, R.}
}
