*Borromeo Ferri, Rita (2006). Theoretical and empirical differentiations of phases in the modelling process. In: Zentralblatt für Didaktik der Mathematik, 38 (2), S. 86-95. | *Borromeo Ferri, Rita (2006). Theoretical and empirical differentiations of phases in the modelling process. In: Zentralblatt für Didaktik der Mathematik, 38 (2), S. 86-95. |