TY  - JOUR
AU  - J.A. Lester
TI  - A Characterization of Motions as Bijections Preserving Inradius or Circumradius One.
JO  - Monatshefte für Mathematik
PY  - 1986
SP  - 151
EP  - 158
VL  - 101
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MOMA_1986__101_178270/
ID  - MOMA_1986__101_178270
ER  -