TY  - JOUR
AU  - Borwein, J.
AU  - O’Brien, R.
TI  - Tangent Cones and Convexity
JO  - Canadian mathematical bulletin
PY  - 1976
SP  - 257
EP  - 261
VL  - 19
IS  - 3
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1976-040-x/
DO  - 10.4153/CMB-1976-040-x
ID  - 10_4153_CMB_1976_040_x
ER  -