By Li Lin   Huo Jia-Zhen   in International Journal of Services Operations and Informatics

ISSN:1741-539X|4|4|295-316

Inderscience Publishers‎(2009)‎

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By Zheng Shui   Lin Huo   Hu Di   in Acta Mathematica Sinica

ISSN:1439-8516|21|5|1137-1148

Springer Publishing Company ‎(2005)‎

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