%0 Journal Article
%A Andrzej Makowski
%T Angles of a Parallelogram with Vertices in Lattice Points.
%J Elemente der Mathematik
%D 1969
%P 114-115
%V 24
%I mathdoc
%U http://geodesic.mathdoc.fr/item/ELMA_1969__24_140942/
%F ELMA_1969__24_140942