Techniques of semigroup theory PM Higgins Oxford University Press on Demand, 1992 | 464 | 1992 |

The Monoid of Orientation-perserving Mappings on a Chain. PM Catarino, PM Higgins Semigroup Forum 58 (2), 1999 | 85 | 1999 |

Combinatorial results for semigroups of order-preserving mappings PM Higgins Mathematical Proceedings of the Cambridge Philosophical Society 113 (2), 281-296, 1993 | 78 | 1993 |

On relative ranks of full transformation semigroups JM Howie, N Ruškuc, PM Higgins Communications in Algebra 26 (3), 733-748, 1998 | 70 | 1998 |

Divisors of semigroups of order-preserving mappings on a finite chain PM Higgins International Journal of Algebra and Computation 5, 725-742, 1995 | 53 | 1995 |

Countable versus uncountable ranks in infinite semigroups of transformations and relations PM Higgins, JM Howie, JD Mitchell, N Ruškuc Proceedings of the Edinburgh Mathematical Society 46 (3), 531-544, 2003 | 50 | 2003 |

Generators and factorisations of transformation semigroups PM Higgins, JM Howie, N Ruškuc Proceedings of the Royal Society of Edinburgh Section A: Mathematics 128 (6 …, 1998 | 44 | 1998 |

Number story: From counting to cryptography PM Higgins Springer Science & Business Media, 2008 | 43 | 2008 |

Epimorphisms and amalgams PM Higgins Colloquium Mathematicum 56 (1), 1-17, 1988 | 39 | 1988 |

Saturated and epimorphically closed varieties of semigroups PM Higgins Journal of the Australian Mathematical Society 36 (2), 153-175, 1984 | 33 | 1984 |

Generating the full transformation semigroup using order preserving mappings PM Higgins, JD Mitchell, N Ruškuc Glasgow Mathematical Journal 45 (3), 557-566, 2003 | 27 | 2003 |

A proof of Simon's theorem on piecewise testable languages PM Higgins Theoretical Computer Science 178 (1-2), 257-264, 1997 | 24 | 1997 |

The range order of a product of i transformations from a finite full transformation semigroup PM Higgins Semigroup forum 37 (1), 31-36, 1988 | 23 | 1988 |

Epis are onto for generalised inverse semigroups PM Higgins Semigroup Forum 23 (1), 255-259, 1981 | 23 | 1981 |

Rank properties of endomorphisms of infinite partially ordered sets PM Higgins, JD Mitchell, M Morayne, N Ruškuc Bulletin of the London Mathematical society 38 (2), 177-191, 2006 | 22 | 2006 |

Finite aperiodic semigroups with commuting idempotents and generalizations PM Higgins, SW Margolis Israel Journal of Mathematics 116 (1), 367-380, 2000 | 22 | 2000 |

Epimorphisms, permutation identities and finite semigroups PM Higgins Semigroup Forum 29 (1), 87-97, 1984 | 22 | 1984 |

Founder centrality, management team congruence and performance in family firms: A Kenyan context L Kelly, PM Lewa, K Kamaria Journal of Developmental Entrepreneurship 13 (04), 383-407, 2008 | 19 | 2008 |

Digraphs and the semigroup of all functions on a finite set PM Higgins Glasgow mathematical journal 30 (1), 41-57, 1988 | 19 | 1988 |

Nets, puzzles, and postmen: An exploration of mathematical connections PM Higgins Oxford University Press, 2007 | 18 | 2007 |