@book {758,
	title = {Early Mathematics Learning. Selected Papers of the POEM 2012 Conference.},
	year = {2013},
	publisher = {Springer},
	organization = {Springer},
	address = {New York},
	editor = {Kortenkamp, Ulrich and Brandt, Birgit and Benz, Christiane and Krummheuer, G{\"o}tz and Ladel, Silke and Vogel, Rose}
}
