TY  - JOUR
AU  - Andrzej Makowski
TI  - Angles of a Parallelogram with Vertices in Lattice Points.
JO  - Elemente der Mathematik
PY  - 1969
SP  - 114
EP  - 115
VL  - 24
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ELMA_1969__24_140942/
ID  - ELMA_1969__24_140942
ER  -