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Ladel, S., & Kortenkamp, U..  (2009).  Realisation of MERs (Multiple Extern Representations) and MERLs (Multiple Equivalent Linked Representations) in Elementary Mathematics Software. In V.  Durand-Guerrier, Soury-Lavergne, S., & Arzarello, F. (Hrsg.), Proceedings of the Sixth Congress of the European Society for Research in Mathematics Education. January 28th - February 1st 2009, Lyon (France). gehalten auf der Januar, Februar, Lyon, France: Congress of the European Society for Research in Mathematics Education (CERME).\par \par }