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@article{MAN_1973__201_162381, author = {Hansjoachim Groh}, title = {Moebius {Planes} with {Locally} {Euclidean} {Circles} {Are} {Flat.}}, journal = {Mathematische Annalen}, pages = {149--156}, publisher = {mathdoc}, volume = {201}, year = {1973}, zbl = {0234.50021}, url = {http://geodesic.mathdoc.fr/item/MAN_1973__201_162381/} }
Hansjoachim Groh. Moebius Planes with Locally Euclidean Circles Are Flat.. Mathematische Annalen, Tome 201 (1973), pp. 149-156. http://geodesic.mathdoc.fr/item/MAN_1973__201_162381/