@incollection{bib:Au07accidental,
        Author = {Tsz-Chiu Au and Dana Nau},
        Booktitle = {The Iterated Prisoners' Dilemma: 20 Years on},
        Pages = {231--262},
        Publisher = {World Scientific},
        Title = {Is it Accidental or Intentional? A Symbolic Approach to the Noisy Iterated Prisoner's Dilemma},
        Year = {2007}}