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@article{MZ_1978__159_172647, author = {Paul E. Ehrlich and Hans-Christoph Im Hof}, title = {Metric {Circles} and {Bisectors.}}, journal = {Mathematische Zeitschrift}, pages = {101--106}, publisher = {mathdoc}, volume = {159}, year = {1978}, zbl = {0354.53037}, url = {http://geodesic.mathdoc.fr/item/MZ_1978__159_172647/} }
Paul E. Ehrlich; Hans-Christoph Im Hof. Metric Circles and Bisectors.. Mathematische Zeitschrift, Tome 159 (1978), pp. 101-106. http://geodesic.mathdoc.fr/item/MZ_1978__159_172647/