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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research
 

Summary: This article appeared in a journal published by Elsevier. The attached
copy is furnished to the author for internal non-commercial research
and education use, including for instruction at the authors institution
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Author's personal copy
Journal of Computer and System Sciences 75 (2009) 287302
Contents lists available at ScienceDirect
Journal of Computer and System Sciences
www.elsevier.com/locate/jcss
On approximating four covering and packing problems
Mary Ashley a,1

  

Source: Ashley, Mary V. - Department of Biological Sciences, University of Illinois at Chicago

 

Collections: Biology and Medicine; Environmental Sciences and Ecology