%0 Journal Article
%A Bożena Maj-Tatsis
%A Mirosława Sajka
%T The Ninth and the Tenth Congress of the European Research in Mathematics Education (CERME 9 and CERME 10)
%J Didactica Mathematicae
%D 2017
%V 39
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.14708/dm.v39i0.6344/
%R 10.14708/dm.v39i0.6344
%G pl
%F 10_14708_dm_v39i0_6344