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中国科学院数学与系统科学研究院期刊网
ISSN 0168-9673 CN 11-2041/O1
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On Ekeland’s Variational Principle for Set-Valued Mappings
Sheng-jie Li, Wen-yan Zhang
Acta Mathematicae Applicatae Sinica(English Series) . 2007, (
1
): 141 -148 .