References
Lisa Hefendehl-Hebeker
with Gellert, U. , Leuders, T. (2019). Educational research on mathematics: a short survey of its development in German speaking countries. In L. Hefendehl-Hebeker (Ed.). Traditions in German-speaking mathematics education research (pp. 1-23). Dordrecht: Springer.
(2019). Subject-matter didactics. In L. Hefendehl-Hebeker (Ed.). Traditions in German-speaking mathematics education research (pp. 25-59). Dordrecht: Springer.
(ed) (2019). Traditions in German-speaking mathematics education research. Dordrecht: Springer.