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@article{chen+lin,
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@article{liu+et+al,
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  JOURNAL = {{Computers in Industry}},
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  PAGES = {15p.},
  YEAR = {2007},
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@Book{metafont,
  author =	"Donald E. Knuth",
  title =	"METAFONT: The Program",
  volume =	"D",
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  address =	"pub-AW:adr",
  pages =	"xv + 560",
  year = 	"1986",
  ISBN = 	"0-201-13438-1",
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  bibdate =	"Fri Jul 22 09:06:27 1994",
  bibsource =	"http://www.math.utah.edu/pub/tex/bib/texbook3.bib",
  price =	"US\$32.95",
  series =	"Computers and Typesetting",
}