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15. *The structure of a graph inverse semigroup* (with J. D. Mitchell), Semigroup Forum, to appear. (arXiv) |

14. *Traces on semigroup rings and Leavitt path algebras* (with L. Vas), Glasgow Math. J., to appear. (arXiv) |

13. *Polynomials of small degree evaluated on matrices*, Lin. Multilin. Alg. **61** (2013) 1487-1495. (arXiv) |

12. *Commutator Leavitt path algebras*, Algebr. Represent. Theory **16** (2013) 1207-1232. (arXiv) |

11. *The Bergman-Shelah preorder on transformation semigroups* (with J. D. Mitchell, M. Morayne, and Y. Peresse), Math. Logic Quart. **58** (2012) 424-433. (arXiv) |

10. *Monoids of injective maps closed under conjugation by permutations*, Israel J. Math. **189** (2012) 287-305. (arXiv) |

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8. *Groups where free subgroups are abundant*, J. Algebra **344** (2011) 161-171. (arXiv) |

7. *Conjugation of injections by permutations*, Semigroup Forum **81** (2010) 297-324. (arXiv) |

6. *The ideals of an ideal extension*, J. Algebra Appl. **9** (2010) 407-431. (arXiv) |

5. *On minimal extensions of rings* (with T. J. Dorsey), Comm. Algebra **37** (2009) 3463-3486. (arXiv) |

4. *Generating self-map monoids of infinite sets*, Semigroup Forum **75** (2007) 648-675. (arXiv) |

3. *Endomorphism rings generated using small numbers of elements*, Bull. London Math. Soc. **39** (2007) 290-300. (arXiv) |

2. *Commutator rings*, Bull. Austral. Math. Soc. **74** (2006) 279-288. (arXiv) |

1. *Generating endomorphism rings of infinite direct sums and products of modules*, J. Algebra **283** (2005) 364-366. (arXiv) |