Bibliography

@Book{Howie95,
  author =       "John M. Howie",
  title =        "Fundamentals of Semigroup Theory",
  publisher =    "Oxford University Press",
  year =         "1995",
  volume =       "12",
  series =       "London Mathematical Society Monographs New Series"
}

@Book{Lallement79,
  author =       "G{\accent19 e}rard Lallement",
  title =        "Semigroups and Combinatorial Applications",
  publisher =    "Wiley, New York",
  year =         "1979"
}

@Article{LPRR1,
  author =       "Linton, S. A. and Pfeiffer, G. and Robertson,
                  E. F. and Ru{\v s}kuc, N.",
  title =        "Groups and actions in transformation semigroups",
  year =         "1998",
  journal =      "Math. Z.",
  volume =       "228",
  pages =        "435--450"
}

@Unpublished{LPRR2,
  author =       "Linton, S. A. and Pfeiffer, G. and Robertson,
                  E. F. and Ru{\v s}kuc, N.",
  title =        "Computing transformation semigroups",
  note =         "submitted"
}