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

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

@unpublished{Simpson,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

@incollection{Er01,
        author = "P. Erd{\H o}s",
        title = "A selection of problems and results in combinatorics",
        booktitle = "Recent trends in combinatorics (Matrahaza, 1995)",
        publisher = "Cambridge Univ. Press",
        address = "Cambridge",
        pages = "1--6",
        year = "1995"
}
@article{greenwade93,
    author  = "George D. Greenwade",
    title   = "The {C}omprehensive {T}ex {A}rchive {N}etwork ({CTAN})",
    year    = "1993",
    journal = "TUGBoat",
    volume  = "14",
    number  = "3",
    pages   = "342--351"
}