@inbook {999, title = {Mathematische Schnitzeljagd mit Actionbound - Mathematik in der Umwelt neu entdecken}, booktitle = {Mathematik mit digitalen Medien - konkret. Ein Handbuch f{\"u}r Lehrpersonen in der Primarstufe}, year = {2018}, pages = {77-90}, publisher = {WTM-Verlag}, organization = {WTM-Verlag}, address = {M{\"u}nster}, author = {Schaffer, Max and Schreiber, Christof and Schulz, Kristina}, editor = {Ladel, S. and Kortenkamp, U. and Etzold, H.} } @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.} }