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Journal Article
Ladel, S., & Kortenkamp U. (2009).  Virtuell-enaktives Arbeiten mit der „Kraft der Fünf''. MNUprimar. PDF icon LadelKortenkamp-VAGKF-2009a.pdf (722.46 KB)
Ladel, S., & Kortenkamp U. (2013).  An activity-theoretic approach to multi-touch tools in early maths learning. The International Journal for Technology in Mathematics Education. 20, PDF icon LadelKortenkamp-ATATEMLO-ICME-2013.pdf (426.48 KB)
Conference Paper
Ladel, S., & Kortenkamp U. (2009).  Realisations of MERS (Multiple Extern Representations) and MELRS (Multiple Equivalent Linked Representations) in Elementary Mathematics Software. (Durand-Guerrier, V., Soury-Lavergne S., & Arzarello F., Ed.).Proceedings of the Sixth Congress of the European Society for Research in Mathematics Education. January 28th - February 1st 2009, Lyon (France). PDF icon LadelKortenkamp-RMMERMMELREMS-2009a.pdf (355.73 KB)
Ladel, S., & Kortenkamp U. (2011).  Implementation of a multi-touch-environment supporting finger symbol sets. Proceedings of CERME 7, Rzeszow. PDF icon LadelKortenkamp-IMSFSS-2011b.pdf (274.33 KB)
Ladel, S., & Kortenkamp U. (2011).  Finger-Symbol-Sets and Multi-Touch for a better understanding of numbers and operations. Proceedings of CERME 7, Rzeszow. PDF icon LadelKortenkamp-FMBUNO-2011a.pdf (598.13 KB)
Ladel, S., & Kortenkamp U. (2012).  Early maths with multi-touch – an activity-theoretic approach. Proceedings of POEM 2012. PDF icon LadelKortenkamp-EMWMAA-2012a.pdf (1.91 MB)
Ladel, S., & Kortenkamp U. (2011).  An activity-theoretic approach to multi-touch tools in early maths learning. Proceedings of ATATEMLO 2011 in Paris. PDF icon LadelKortenkamp-AAMTEML-2011a.pdf (762.62 KB)
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