中国科学院数学与系统科学研究院期刊网
AMS
A General Vectorial Ekeland’s Variational Principle with a P-distance
Jing Hui QIU, Fei HE
Acta Mathematica Sinica . 2013, (9): 1655 -1678 .  DOI: 10.1007/s10114-013-2284-z