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@article{ELMA_1969__24_140942, author = {Andrzej Makowski}, title = {Angles of a {Parallelogram} with {Vertices} in {Lattice} {Points.}}, journal = {Elemente der Mathematik}, pages = {114--115}, publisher = {mathdoc}, volume = {24}, year = {1969}, zbl = {0182.37801}, url = {http://geodesic.mathdoc.fr/item/ELMA_1969__24_140942/} }
Andrzej Makowski. Angles of a Parallelogram with Vertices in Lattice Points.. Elemente der Mathematik, Tome 24 (1969), pp. 114-115. http://geodesic.mathdoc.fr/item/ELMA_1969__24_140942/