急求英文数学文献2篇(有连接)

急求如下论文：
1.题目：Optimality conditions for bilevel programming problems
杂志名：Optimization: A Journal of Mathematical Programming and Operations Research
发表卷、时间：Volume 33, Issue 1, 1995, Pages 9 - 27
Authors: J. J. Ye; D. L. Zhu
连接：http://www.informaworld.com/smpp/content~db=all~content=a772438692
2.题目：A note on optimality conditions for bilevel programming problems *
杂志名：Optimization: A Journal of Mathematical Programming and Operations Research
发表卷、时间：Volume 39, Issue 4, 1997, Pages 361 - 366
Authors: J. J. Ye; D. L. Zhu
DOI: 10.1080/02331939708844290
连接：http://www.informaworld.com/smpp/content~db=all~content=a772425366~frm=titlelink?words=note,optimality,conditions,bilevel,programming,problems

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谢谢，已经找到！