TY  - JOUR
AU  - Robkin, Eugene
AU  - Valentine, F. A.
TI  - Parallel Lines Associated with Two Sets
JO  - Canadian journal of mathematics
PY  - 1966
SP  - 811
EP  - 816
VL  - 18
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1966-080-9/
DO  - 10.4153/CJM-1966-080-9
ID  - 10_4153_CJM_1966_080_9
ER  -