@inbook {850, title = {Einsatz virtueller Materialien zum Thema {\quotedblbase}F{\"o}rderung des r{\"a}umlichen Vorstellungsverm{\"o}gens{\textquotedblleft} am Beispiel der App Kl{\"o}tzchen}, booktitle = {Digitale Medien im Mathematikunterricht der Primarstufe. Ein Handbuch f{\"u}r die Lehrerausbildung. 3. Band der Reihe Lernen, Lehren und Forschen mit digitalen Medien in der Primarstufe}, year = {2017}, pages = {131-148}, publisher = {WTM-Verlag}, organization = {WTM-Verlag}, address = {M{\"u}nchen}, author = {Ladel, Silke and Kuzle, Ana}, editor = {Ladel, Silke and Schreiber, Christof and Rink, Roland} } @inbook {843, title = {Delving into the nature of problem solving processes in a dynamic geometry environment: Different technological effects on cognitive processing}, booktitle = {Technology, Knowledge and Learning}, year = {2016}, pages = {1-28}, publisher = {Springer Verlag}, organization = {Springer Verlag}, address = {Berlin Heidelberg}, author = {Kuzle, Ana} }