TY  - JOUR
AU  - Forder, H. G.
TI  - On Order in a Plane
JO  - Canadian journal of mathematics
PY  - 1967
SP  - 997
EP  - 1000
VL  - 19
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1967-090-0/
DO  - 10.4153/CJM-1967-090-0
ID  - 10_4153_CJM_1967_090_0
ER  -