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@article{MOMA_1986__101_178270, author = {J.A. Lester}, title = {A {Characterization} of {Motions} as {Bijections} {Preserving} {Inradius} or {Circumradius} {One.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {151--158}, publisher = {mathdoc}, volume = {101}, year = {1986}, zbl = {0583.51014}, url = {http://geodesic.mathdoc.fr/item/MOMA_1986__101_178270/} }
J.A. Lester. A Characterization of Motions as Bijections Preserving Inradius or Circumradius One.. Monatshefte für Mathematik, Tome 101 (1986), pp. 151-158. http://geodesic.mathdoc.fr/item/MOMA_1986__101_178270/