@article{Knuth92,
  title         = "Two notes on notation",
  author        = "D.E. Knuth",
  year          = "1992",
  journal       = "Amer. Math. Monthly",
  volume        = "99",
  pages         = "403--422"
}

@book{ConcreteMath,
  title         = "Concrete mathematics",
  author        = "R.L. Graham and D.E. Knuth and O. Patashnik",
  year          = "1989",
  publisher     = "Addison-Wesley",
  address       = "Reading, MA"
}

@unpublished{Simpson,
  title         = "Proof of the {R}iemann {H}ypothesis",
  author        = "H. Simpson",
  year          = "2003",
  note          = "preprint (2003), available at \texttt{http://www.math.drofnats.edu/riemann.ps}"
}

@incollection{Er01,
  title         = "A selection of problems and results in combinatorics",
  author        = "P. Erd{\H o}s",
  year          = "1995",
  booktitle     = "Recent trends in combinatorics (Matrahaza, 1995)",
  publisher     = "Cambridge Univ. Press",
  address       = "Cambridge",
  pages         = "1--6"
}

@article{greenwade93,
  title         = "The {C}omprehensive {T}ex {A}rchive {N}etwork ({CTAN})",
  author        = "George D. Greenwade",
  year          = "1993",
  journal       = "TUGBoat",
  volume        = "14",
  number        = "3",
  pages         = "342--351"
}