@article {KorWinZol-Z-2011, title = {Stein f{\"u}r Stein: Mauern bauen {\textendash} Strukturen erkennen}, journal = {Grundschulunterricht}, year = {2013}, keywords = {lehrer}, author = {Kortenkamp, Ulrich and Winter, Christiane and Z{\"o}llner, Johanna} }