中国科学院数学与系统科学研究院期刊网
AMS
Subdifferential Representation of Homogeneous Functions and Extension of Smoothness in Banach spaces
Fu Chun YANG, Zhou WEI, Dong WANG
Acta Mathematica Sinica . 2010, (8): 1535 -1544 .  DOI: 10.1007/s10114-010-8289-y