TY  - JOUR
AU  - Beer, Gerald
TI  - The Continuity of the Visibility Function on a Starshaped Set
JO  - Canadian journal of mathematics
PY  - 1972
SP  - 989
EP  - 992
VL  - 24
IS  - 5
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1972-100-7/
DO  - 10.4153/CJM-1972-100-7
ID  - 10_4153_CJM_1972_100_7
ER  -