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Ladel, S., Rink, R., Schreiber, C., & Walter, D..  (2020).  Forschung zu und mit digitalen Medien ? Befunde f\'fcr die Primarstufe. 6. Band der Reihe Lernen, Lehren und Forschen mit digitalen Medien in der Primarstufe. M\'fcnster: WTM-Verlag.\par \par Kortenkamp, U., & Ladel, S..  (2014).  Flexible Use and Understanding of Place Value Via Traditional and Digital Tools. Research Report. In P.  Lilijedahl, Nicol, C., Oesterle, S., & Allan, D. (Hrsg.), Proceedings of the 38th Conference of the International Group for the Psychology of Mathematics Education and the 36th Conference of the North American Chapter of the Psychology of Mathematics Education. Vancouver, Canada: Psychology of Mathematics Education (PME).\par \par Ladel, S., & Kortenkamp, U..  (2011).  Finger-symbol-sets and multi-touch for a better understanding of numbers and operations. In M.  Pytlak, Rowland, T., & Swoboda, E. (Hrsg.), Proceedings of the Seventh Congress of the European Society for Research in Mathematics Education.. gehalten auf der Februar, Rzesz\'f3w, Poland: Congress of the European Society for Research in Mathematics Education (CERME).\par \par }