@article {brignall:simple-enum:,
    AUTHOR = {Brignall, Robert and Huczynska, Sophie and Vatter, Vincent},
     TITLE = {Simple permutations and algebraic generating functions},
   JOURNAL = {J. Combin. Theory Ser. A},
  FJOURNAL = {Journal of Combinatorial Theory. Series A},
    VOLUME = {115},
      YEAR = {2008},
    NUMBER = {3},
     PAGES = {423--441},
      ISSN = {0097-3165},
     CODEN = {JCBTA7},
   MRCLASS = {05A15 (05A05)},
  MRNUMBER = {MR2402603}
}