中国科学院数学与系统科学研究院期刊网
JCM
A. S. Convergence of two-parameter banach space valued martingales and the radon-nikodym property of banach spaces
Shixin Gan
Acta Mathematica Sinica . 1999, (2): 187 -196 .  DOI: 10.1007/BF02650662