Restriction and Ehresmann
semigroups, pp 265-288 in Proceedings of the International Conference on Algebra 2010, Advances in Algebraic Structures, World Scientific 2012. ISBN-13 978-981-4366-30-4 and
ISBN-10 981-4366-30-7.
Axiomatisability of free, projective and flat
acts, pp 41-56 in Proceedings of the meeting `Semigroups, Acts and
Categories',
Tartu, June 2007,
Mathematics Studies 3, Estonian Mathematical Society, Tartu 2008.
Inverse semigroups
with zero: covers and
their structure, (with S. Bulman-Fleming and J.B. Fountain)
J.
Austral. Math. Soc. Ser. A 67 (1999), no. 1, 15--30.
Independence structures, in `Proceedings of the International Conference
`Semigroups and their applications, including semigroup rings',
St. Petersburg, June 19-30 1995'. Edited by P. Higgins,
S. Kublovsky, A. Mikhalev and J. Ponizovskii. Russian State
Hydrometeorological Institute: St. Petersburg , 1996.
Semigroups of left quotients - the uniqueness problem,
Proc. Edinburgh Math. Soc. 35 (1992), 213-226.
Orders in semiprime rings
with minimal condition for principal right
ideals, (with J.B. Fountain)
Proc. Roy. Soc. Edinburgh Sect. A 121 (1992), no. 3-4,
375--380.
Straight left orders in
rings, (with J.B. Fountain) Quart. J. Math. Oxford Ser. (2) 43
(1992), no. 171, 303--311.
Left orders in regular H-semigroups I, J. Algebra
141 (1991), 11-35.
Completely right pure monoids - the general case, Mathematika
38 (1991), 77-88.
Orders in regular rings
with minimal condition for principal right ideals, (with J.B. Fountain)
Comm. Algebra 19 (1991),no. 5, 1501--1527.
Abundant enlargements of monoids, in `Proceedings of the Monash
Conference on Semigroup Theory', 86-100.
Edited by T.E. Hall, P.R. Jones and J.C. Meakin,
World Scientific Publishing Co.,
1991.
Left orders in inverse w-semigroups, Quarterly J. Math.
Oxford} 41 (1990), 21-44.
Completely right pure monoids on which H is a right congruence,
Math. Proc. Cambridge Phil. Soc. 107 (1990), 275-285.
Left orders in regular H-semigroups II,
Glasgow Math. J.
32 (1990), 95-108.
On left absolutely flat monoids, (with S. Bulman-Fleming)
Semigroup Forum 41 (1990), 55-59.
A new approach to orders in simple rings with
minimal one-sided ideals,
(with M. Petrich), Semigroup Forum 41 (1990), 267-290.
Every Hamiltonian variety has the C.E.P.-
a short proof, (with M.M.W. Wild) Algebra Universalis
26 (1989), 187-188.
Absolutely flat completely 0-simple semigroups of left
quotients, J. Pure Appl. Algebra 55 (1988), 261-288.
Orders in semigroups, in `Contributions to General Algebra 5', 163-169,
Verlag Hölder-Pichler-Tempsky, Vienna, 1987.
Divisible S-systems and R-modules, Proc. Edinburgh Math. Soc.
30 (1987), 187-200.
Coperfect monoids, Glasgow Math. J. 29 (1987), 73-88.
Axiomatisability problems for S-systems, J. London Math. Soc.
35 (1987), 193-201.
Model Companions of S-systems, Quarterly J. Math. Oxford
38 (1987), 189-211.
Completely right pure monoids, Proc. Royal Irish Acad. 87A
(1987), 73-82.
Semigroups of quotients, in `Proceedings of the International
Symposium on the Theory of Regular Semigroups and Applications', 47-70.
Edited by K.S.S. Nambooripad, R. Veeramony and A.R. Rajan,
Publication No. 11 of the Centre for Mathematical Sciences, Kerala,
1986.
Clifford semigroups of left quotients, Glasgow Math. J. 28
(1986), 181-191.
The characterisation of monoids by properties of their S-systems,
Semigroup Forum 32 (1985), 251-265.
Completely 0-simple semigroups of quotients
II (with J.B. Fountain), in `Contributions to General Algebra 3', 115-124,
Verlag Höder-Pichler-Tempsky, Vienna, 1985.
Bisimple inverse w-semigroups of left quotients,
Proc. London
Math. Soc. 52 (1985), 95-118.
Submissions, Preprints, Pre-preprints and Notes
Constellations with range, with T. Stokes (in preparation).