Nicola M.R. Oswald
E-mail:
This e-mail address is being protected from spambots. You need JavaScript enabled to view it ,
This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
Address:

Department of Mathematics,

Würzburg University,

Emil-Fischer-Straÿe 40, 97074 Würzburg, Germany;

Department of Mathematics Education,

Wuppertal University,

Gauÿstraÿe 20, 42119 Wuppertal, Germany;