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@Comment{refnotes,
  namespace = "references"
}
 
@Book{Knuth68,
  author    = {Donald E. Knuth},
  title     = {The Art of Computer Programming, Volume 1: Fundamental Algorithms},
  publisher = {Addison-Wesley},
  year      = {1968},
  isbn      = {0-201-03801-3},
  url       = {http://example.com/Knuth68}
}