TY  - JOUR
AU  - J.M. Borwein
TI  - A Lagrange multiplier theorem and a sandwich theorem for convex relations.
JO  - Mathematica Scandinavica
PY  - 1981
SP  - 189
EP  - 204
VL  - 48
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MS2_1981__48_166749/
ID  - MS2_1981__48_166749
ER  -