TY  - JOUR
AU  - Petty, C. M.
AU  - Crotty, J. M.
TI  - Characterizations of Spherical Neighbourhoods
JO  - Canadian journal of mathematics
PY  - 1970
SP  - 431
EP  - 435
VL  - 22
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1970-051-9/
DO  - 10.4153/CJM-1970-051-9
ID  - 10_4153_CJM_1970_051_9
ER  -