%0 Journal Article
%A Milosav M. Marjanović
%A Aleksandra N. Mandić
%T Understanding algorithms of vertical addition and subtraction
%J The Teaching of Mathematics
%D 2009
%P 57 
%V XII
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TM2_2009_XII_2_a1/
%G en
%F TM2_2009_XII_2_a1