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<bibtex>
 
<bibtex>
@article{MATHEDUC.05791146,
+
@book{MATHEDUC.05791146,
 
Author = {Moser Opitz, Elisabeth},
 
Author = {Moser Opitz, Elisabeth},
 
Journal = {Journal f\"ur Mathematik-Didaktik}, Number = {3/4},
 
Journal = {Journal f\"ur Mathematik-Didaktik}, Number = {3/4},