@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/}
}