TY  - JOUR
AU  - Ding, Xie Ping
AU  - Tan, Kok-Keong
TI  - A Set-Valued Generalization of Fan's Best Approximation Theorem
JO  - Canadian journal of mathematics
PY  - 1992
SP  - 784
EP  - 796
VL  - 44
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1992-046-9/
DO  - 10.4153/CJM-1992-046-9
ID  - 10_4153_CJM_1992_046_9
ER  -