Publications and Preprints

Published

• Products of idempotent endomorphisms of relatively free algebras with weak exchange properties, (with V. Gould), Proc. Edinburgh Math. Soc., 50 (2007), 343--362.
• Proper covers of ample monoids, (pdf) (with G. M. S. Gomes), Proc. Edinburgh Math. Soc., 49 (2006), 277--289.
• Finite abundant semigroups in which the idempotents form a subsemigroup, (pdf) (with G. M. S. Gomes), J. Algebra, 295 (2006), 303--313.
• Proper covers for left ample semigroups, (pdf) (with A. El Qallali), Semigroup Forum, 71 (2005), 411--427.
• A description of normal semigroups of endomorphisms of proper independence algebras, (pdf) (with J. Araujo), Communications in Alg., 33 (2005), 2705--2711.
• Endomorphisms of relatively free algebras with weak exchange properties, (pdf) (with V. Gould), Alg. Universalis 51 (2004), 257--285.
• Covers for monoids, (pdf) (with J.-E. Pin and P. Weil), J. Algebra. 271 (2004), no. 2, 529--586.
• Hyperbolic groups and completely simple semigroups, (pdf) (with M. Kambites). Proceedings of the Workshop Semigroups and Languages (Lisbon, Nov. 2002), World Scientific (2004), 106--132.
• The origins of independence algebras, (pdf) (with J. Araujo), Proceedings of the Workshop Semigroups and Languages (Lisbon, Nov. 2002), World Scientific (2004), 54--67.
• Relatively free algebras with weak exchange properties, (pdf) (with V. Gould), J. Austral. Math. Soc. 75 (2003), 355--384.
• An introduction to covers for semigroups, (pdf) in `Semigroups, Algorithms, Automata and Languages', 155--194. Edited by G. M. S. Gomes, J.-E. Pin and P. Silva, World Scientific, Singapore, 2002.
• Maximal orders in completely 0-simple semigroups, (pdf) (with V. Gould) Period. Math. Hungar. 44 (2002),
  no. 1, 45--61.
• Primitive inverse congruences on categorical semigroups, (pdf) (with G. M. S. Gomes) Proc. Edinburgh Math.
  Soc. (2) 43 (2000), no. 2, 395--413.
• A Munn type representation for a class of E-semiadequate semigroups, (pdf) (with G. M. S. Gomes and V. Gould)
  J. Algebra 218 (1999), no. 2, 693--714.
• Inverse semigroups with zero: covers and their structure, (with S. Bulman-Fleming and V. Gould) J. Austral.
  Math. Soc. Ser. A 67 (1999), no. 1, 15--30.
• Enlargements, semiabundancy and unipotent monoids, (pdf) (with G. M. S. Gomes and V. Gould) Comm. Algebra
  27 (1999), no. 2, 595--614.
• Maximal orders in semigroups, (pdf) (with V. Gould and P. Smith) Comm. Algebra 27 (1999), no. 1, 173--187.
• Semigroups, formal languages and groups. Proceedings of the NATO Advanced Study Institute
  held at the University of York, York, August 7--21, 1993. Edited by John Fountain. NATO Advanced Science
  Institutes Series C: Mathematical and Physical Sciences, 466. Kluwer Academic Publishers Group, Dordrecht,
  1995. x+428 pp. ISBN: 0-7923-3540-6.
• Products of idempotent endomorphisms of free acts of infinite rank, (with S. Bulman-Fleming) Monatsh. Math.
  124 (1997), no. 1, 1--16.
• Orders in normal bands of groups,(with M. Petrich) Mathematika 43 (1996), no. 2, 295--319 (1997).
• Maximal orders in semigroups, in `Semigroups, automata and languages (Porto, 1994)', 111--124, World Sci.
  Publishing, River Edge, NJ, 1996.
• Left orders in completely 0-simple semigroups (with P. N. Ánh and L. Márki) Semigroup Forum 53 (1996),
  no. 1, 114--128.
• The depth of the semigroup of balanced endomorphisms. Mathematika 41 (1994), no. 1, 199--208.
• Proper left type-A covers, (with G. M. S. Gomes) Portugal. Math. 51 (1994), no. 2, 305--319.
• Idempotent bounded C-semigroups, (with V. Gould) Monatsh. Math. 117 (1994), no. 3-4, 237--254.
• Left idempotent bounded C-semigroups, (with V. Gould) Acta Sci. Math. (Szeged) 58 (1993), no. 1-4, 43--65.
• Proper left type-A monoids revisited, (with G. M. S. Gomes) Glasgow Math. J. 35 (1993), no. 3, 293--306.
• Products of idempotent endomorphisms of an independence algebra of infinite rank, (with A. Lewin) Math.
  Proc. Cambridge Philos. Soc. 114 (1993), no. 2, 303--319.
• Products of idempotent endomorphisms of an independence algebra of finite rank, (with A. Lewin) Proc.
  Edinburgh Math. Soc. (2) 35 (1992), no. 3, 493--500.
• Orders in semiprime rings with minimal condition for principal right ideals, (with V. Gould) Proc. Roy. Soc.
  Edinburgh Sect. A 121 (1992), no. 3-4, 375--380.
• Straight left orders in rings, (with V. Gould) Quart. J. Math. Oxford Ser. (2) 43 (1992), no. 171, 303--311.
• Left proper E-dense monoids, (with G. M. S. Gomes) J. Pure Appl. Algebra 80 (1992), no. 1, 1--27.
• <E>-dense monoids, in `Monash Conference on Semigroup Theory (Melbourne, 1990)', 68--76, World Sci.
  Publishing, River Edge, NJ, 1991.
• Orders in regular rings with minimal condition for principal right ideals, (with V. Gould) Comm. Algebra 19 (1991),
  no. 5, 1501--1527.
• Products of idempotent integer matrices, Math. Proc. Cambridge Philos. Soc. 110 (1991), no. 3, 431--441.
• Free right type A semigroups, Glasgow Math. J. 33 (1991), no. 2, 135--148.
• The Szendrei expansion of a semigroup, (with G. M. S. Gomes) Mathematika 37 (1990), no. 2, 251--260.
• Orders in rings without identity, (with V. Gould) Comm. Algebra 18 (1990), no. 9, 3085--3110.
• E-unitary dense covers of E-dense monoids, Bull. London Math. Soc. 22 (1990), no. 4, 353--358.
• Completely 0-simple semigroups of quotients, III, (with M. Petrich) Math. Proc. Cambridge Philos. Soc.
  105 (1989), no. 2, 263--275.
• Free right h-adequate semigroups, in `Semigroups, theory and applications
  (Oberwolfach, 1986)', 97--120, Lecture Notes in Math., 1320, Springer, Berlin-New York, 1988.
• Completely 0-simple semigroups of quotients, (with M. Petrich) J. Algebra 101 (1986), no. 2, 365--402.
• Semigroups of quotients, in `Proceedings of the 1984 Marquette conference on semigroups (Milwaukee, Wis., 1984)',
  17--28, Marquette Univ., Milwaukee, WI, 1985.
• Completely 0-simple semigroups of quotients, II, (with V. Gould) in `Contributions to general algebra, 3 (Vienna, 1984)',
  115--124, Hölder-Pichler-Tempsky, Vienna, 1985.
• The translational hull of an adequate semigroup (with M. Lawson) Semigroup Forum 32 (1985), no. 1, 79--86.
• Brandt semigroups of quotients, (with M. Petrich) Math. Proc. Cambridge Philos. Soc. 98 (1985), no. 3, 413--426.
• Quasi-adequate semigroups, (with A. El Qallali) Proc. Roy. Soc. Edinburgh Sect. A 91 (1981/82), no. 1-2, 91--99.
• Idempotent-connected abundant semigroups, (with A. El Qallali) Proc. Roy. Soc. Edinburgh Sect. A 91 (1981/82), no. 1-2, 79--90.
• Abundant semigroups, Proc. London Math. Soc. (3) 44 (1982), no. 1, 103--129.
• Connections between left adequate semigroups and g-semigroups, (with A. Batbedat) Semigroup Forum 22 (1981), no. 1, 59--65.
• Bands with distributive congruence lattice (with P. Lockley) Proc. Roy. Soc. Edinburgh Sect. A 84 (1979), no. 3-4, 235--247.
• Adequate semigroups, Proc. Edinburgh Math. Soc. (2) 22 (1979), no. 2, 113--125.
• A class of right PP monoids, Quart. J. Math. Oxford Ser. (2) 28 (1977), no. 111,
  285--300.
• Semilattices of groups with distributive congruence lattice, (with P. Lockley) Semigroup Forum 14 (1977), no. 1,
  81--91.
• Right PP monoids with central idempotents, Semigroup Forum 13 (1976/77), no. 3, 229--237.
• Functions of measures on compact groups(with R. W. Ramsay and J. H. Williamson) Proc. Roy. Irish Acad.
  Sect. A 76 (1976), no. 23, 235--251.
• Perfect semigroups, Proc. Edinburgh Math. Soc. (2) 20 (1976), no. 2, 87--93.
• Completely right injective semigroups, Proc. London Math. Soc. (3) 28 (1974), 28--44.
• Nilpotent semiprincipal rings, Quart. J. Math. Oxford Ser. (2) 24 (1973), 433--450.
• Nilpotent principal ideal rings, Proc. London Math. Soc. (3) 20 (1970), 348--364.

To Appear

• Fundamental representations for classes of semigroups containing a band of idempotents, (pdf) (with A. El Qallali and V. Gould), Communications in Algebra.

Preprints

• Stability of the theory of existentially closed S-sets over a right coherent monoid S, (pdf) (with V. Gould).

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