中国科学院数学与系统科学研究院期刊网
FIXED POINT THEOREMS FOR MULTI-VALUED MAPPINGS IN LOCALLY CONVEX SPACES
Jiahe Jiang 
Acta Mathematica Sinica, Chinese Series . 1982, (3): 365 -373 .  DOI: 10.12386/A1982sxxb0034