https://www.uni-kassel.de/fb10/en/institute/mathematics/persons/details.html?tx_ukpersons_personfunctiondetail%5BpersonFunction%5D=246&cHash=015215970e64a9f1d566d4ef1429980b
Katrin Keller (Didactics of Mathematics) - FB10 - Uni Kassel
didactics of mathematicskatrin kellerunikassel