中国科学院数学与系统科学研究院期刊网
AMS
On a New Geometric Constant Related to the Modulus of Smoothness of a Banach Space
Yasuji TAKAHASHI, Mikio KATO
Acta Mathematica Sinica . 2014, (9): 1526 -1538 .  DOI: 10.1007/s10114-014-2782-7