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@article{DOCMA_1998__S9__a4, author = {Niss, Mogens}, title = {Aspects of the nature and state of research in mathematics education}, journal = {Documenta mathematica}, pages = {767--776}, publisher = {mathdoc}, volume = {ICM Berlin 1998, Vol. III}, year = {1998}, language = {en}, url = {http://geodesic.mathdoc.fr/item/DOCMA_1998__S9__a4/} }
Niss, Mogens. Aspects of the nature and state of research in mathematics education. Documenta mathematica, ICM Berlin 1998, Vol. III (1998), pp. 767-776. http://geodesic.mathdoc.fr/item/DOCMA_1998__S9__a4/