%0 Journal Article
%A Ibolya Szilágyiné Szinger
%T The evolvement of geometrical concepts in lower primary mathematics (Parallel and Perpendicular)
%J Annales mathematicae et informaticae
%D 2008
%P 173-188
%V 35
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AMI_2008_35_a14/
%G en
%F AMI_2008_35_a14