- (with E. F. Robertson, N. Ruskuc & R. M. Thomas) Reidemeister-Schreier
type rewriting for semigroups, Semigroup Forum
**51**(1995), 47-62. - (with E. F. Robertson, N. Ruskuc & R. M. Thomas) Semigroup
and group presentations, Bull. London Math. Soc.
**27**(1995) , 46-50. - (with E. F. Robertson, N. Ruskuc & R. M. Thomas) On
semigroups defined by Coxeter type presentations, Proc. Roy. Soc.
Edinburgh
**125A**(1995), 1063-1075. - (with E. F. Robertson, N. Ruskuc & R. M. Thomas) Rewriting
a semigroup presentation, Internat. J. Algebra Comput.
**5**( 1995), 81-103. - (with E. F. Robertson, N. Ruskuc, R. M. Thomas & Y. Unlu) Certain one relator
products of semigroups, Comm. Algebra
**23**(1995), 5207- 5219. - (with M. J. Brookes & E. F. Robertson) Efficiency and direct products of groups, Groups-Korea '94, Walter de Gruyter, (Berlin - New York, 1995), 25-33.
- (with E. F. Robertson, N. Ruskuc & R. M. Thomas) On subsemigroups
of finitely presented semigroups, J. Algebra
**180**(1996), 1-21. - (with D. M. Gill) On the infiniteness of the Fibonacci group F(5,7),
Algebra Colloq.
**3**(1996), 283-284. - (with E. F. Robertson, N. Ruskuc & R. M. Thomas) On subsemigroups
and ideals in free products of semigroups, Internat. J. Algebra Comput.
**6**(1996), 571-591. - (with E. F. Robertson & P. D. Williams) Efficient presentations for
direct powers of imperfect groups, Algebra Colloq.
**4**(1997) , 21-27. - (with I. Miyamoto, E. F. Robertson & P. D. Williams) Efficient
presentations for PSL(2,p)^3 and other direct products of groups,
Glasgow Math. J.
**39**(1997), 259-268. - (with E. F. Robertson, N. Ruskuc & R. M. Thomas) Presentations
for subsemigroups - applications to ideals of semigroups, J. Pure
Appl. Algebra
**124**(1998), 47-64. - (with G. Havas, S. A. Linton & E. F. Robertson) Symmetric presentations and orthogonal groups, Proc. ATLAS 10 years on, Cambridge University Press, (Cambridge, 1998), 1-10.
- (with E. F. Robertson, N. Ruskuc & R. M. Thomas) Groups, semigroups and finite presentations, Geometric Group Theory Down Under, Walter de Gruyter, (Berlin New York, 1999), 55-69.
- (with H. Ayik, J. J. O'Connor & N. Ruskuc) Minimal presentations and
efficiency of semigroups, Semigroup Forum
**60**(2000), 231-242. - (with H. Ayik, J. J. O'Connor & N. Ruskuc) On the efficiency of wreath products of groups, Proc. Groups Korea '98, Walter de Gruyter, (Berlin New York, 2000), 39-51.
- (with E. F. Robertson, N. Ruskuc & R. M. Thomas) Direct products of
automatic semigroups, J. Austral. Math. Soc.
**69**(2000), 19-24. - (with H. Ayik, J. J. O'Connor & N. Ruskuc) The semigroup efficiency of
groups and monoids, Proc. Roy. Irish Acad. Sect. A
**100A**(2000), 171-176. - (with H. Doostie) Fibonacci length of automorphism groups involving
Tribonacci numbers, Vietnam J. Math.
**28**(2000), 57-66. - (with H. Ayik, J.J. O'Connor & N. Ruskuc) On the efficiency of finite simple
semigroups, Turkish J. Math.
**24**(2000), 129-146. - (with H. Ayik, J.J. O'Connor & N. Ruskuc) The semigroup efficiency of direct powers of groups, Proc. Internat. Conf. on Semigroups, Braga, Portugal 18-23 June 1999, World Scientific, (Singapore, 2000), 19-25.
- (with E. F. Robertson, N. Ruskuc & R. M. Thomas) Automatic semigroups,
Theoret. Comput. Sci.
**250**(2001), 365-391. - (with G. Havas, J. A. Hulpke & E. F. Robertson) Efficient simple groups,
Comm. Algebra
**30**(2002), 971-975 and**31**(2003), 5191-5197. - (with J. D. Mitchell & N. Ruskuc) Comparing semigroup and monoid
presentations for finite monoids, Monatshefte fuer Mathematik
**134**(2002), 287-293. - (with E. F. Robertson, N. Ruskuc & R. M. Thomas) Automatic completely-simple
semigroups, Acta Math. Hungar.
**96**(2002), 201-215. - (with J .D. Mitchell & N. Ruskuc) On defining groups efficiently without
using inverses, Math. Proc. Cambridge Philos. Soc.
**133**(2002), 31-36. - (with J. D. Mitchell & N. Ruskuc) On the efficiency and deficiency of Rees matrix semigroups, Semigroups, Algorithms, Automata and Languages, World Scientific, (Singapore, 2002), 331-339.
- (with P. P. Campbell, B. T. K. Hopson & E. F. Robertson) On the efficiency of direct powers of PGL(2,p), Recent Advances in Group Theory and Low-Dimensional Topology, Heldermann (2003), 27-34.
- (with E. F. Robertson & G. C. Smith)(editors) Groups St Andrews 2001 in
Oxford, Volume 1, London Mathematical Society Lecture Notes in Mathematics
**304**, Cambridge University Press, (Cambridge, 2003). - (with E. F. Robertson & G. C. Smith)(editors) Groups St Andrews 2001 in
Oxford, Volume 2, London Mathematical Society Lecture Notes in Mathematics
**305**, Cambridge University Press, (Cambridge, 2003). - (with P. P. Campbell, H. Doostie & E. F. Robertson) On the Fibonacci length
of powers of dihedral groups, Applications of Fibonacci Numbers
**9**, Kluwer, (Dordrecht, 2004), 69-85. - (with P. P. Campbell, H. Doostie & E. F. Robertson) Fibonacci lengths
for certain metacyclic groups, Algebra Colloq.
**11**(2004), 215-222. - (with G. Havas, C. Ramsay and E. F. Robertson) Nice efficient presentations
for all small simple groups and their covers,
LMS J. Comput. Math.
**7**(2004), 266-283. - (with P. P. Campbell) On the minimal length of semigroup presentations,
Novi Sad J. Math.
**34**(2004), 17-26. - (with P. P. Campbell) The Fibonacci length of certain centro-polyhedral
groups, J. Appl. Math. & Computing
**19**(2005), 231-240. - (with P. P. Campbell) Search techniques and epimorphisms between certain
groups and Fibonacci groups,
Irish Math. Soc. Bull.
**56**(2005), 21-28. - (with P. P. Campbell) The Fibonacci lengths of binary polyhedral groups and
related groups, Applications of Fibonacci Numbers
**10**, Kluwer, (Dordrecht, 2006), 83-91. - (with H. Ayik & J. J. O'Connor) On the efficiency of the direct products of
monogenic monoids, Algebra Colloq.
**14**(2007), 279-284. - (with M. R. Quick, E. F. Robertson & G. C. Smith)(editors) Groups St Andrews 2005,
Volume 1, London Mathematical Society Lecture Notes in Mathematics
**339**, Cambridge University Press, (Cambridge, 2007). - (with M. R. Quick, E. F. Robertson & G. C. Smith)(editors) Groups St Andrews
2005,
Volume 2, London Mathematical Society Lecture Notes in Mathematics
**340**, Cambridge University Press, (Cambridge, 2007). - (with E. F. Robertson)(editors) Groups-St Andrews 1981 (new edition),
London Mathematical Society Lecture Notes in Mathematics
**71**, Cambridge University Press, (Cambridge, 2007). - (with G. Havas & E. F. Robertson) Addendum to an elementary introduction to
coset table methods in computational group theory Groups-St Andrews 1981 (new addition),
London Mathematical Society Lecture Notes in Mathematics
**71**, Cambridge University Press, (Cambridge, 2007). - (with G. Havas, C. Ramsay & E. F. Robertson) On the efficiency of the simple groups with order less than a million and their covers, Experiment.
Math.
**16**(2007), 347-358. - (with P. P. Campbell) The Fibonacci length of binary polyhedral groups and
related groups, Congressus Numerantium
**194**(2009), 95-102. - (with K. Ahmadidelir & H. Doostie) Two classes of finite semigroups
and monoids involving Lucas numbers, Semigroup Forum
**78**(2009), 200-209. - (with Omur Deveci, Erdal Karaduman & Sait Tas)
*k-nacci*sequences in minimal non-abelian*p-*groups, Indian J. Math.**52**(2010), 275-286. - (with Omur Deveci & Erdal Karaduman) The periods of
*k-nacci*sequences in centro-polyhedral and related groups, Ars Combinatoria**97**(2010), 193-210. - (with M. R. Quick, E. F. Robertson, C. M. Roney-Dougal, G. C. Smith & G. Traustason)(editors) Groups
St Andrews 2009 in Bath, Volume 1,
London Mathematical Society Lecture Notes in Mathematics
**387**, Cambridge University Press, (Cambridge, 2011). - (with M. R. Quick, E. F. Robertson, C. M. Roney-Dougal, G. C. Smith & G. Traustason)(editors) Groups
St Andrews 2009 in Bath, Volume 2,
London Mathematical Society Lecture Notes in Mathematics
**388**, Cambridge University Press, (Cambridge, 2011). - (with K. Ahmadidelir & H. Doostie) Almost commutative semigroups, Algebra Colloq.
**18**(Spec 1) (2011), 881-888. - (with Ö. Deveci & E. Karaduman) On the
*k-nacci*sequences in finite binary polyhedral groups, Algebra Colloq.**18**(Spec 1) (2011), 945-954. - (with A. Arjomandfar and H. Doostie) Semigroups related to certain group presentations, Semigroup Forum
**85**(2012), 533-539. - (with G. Havas, C. Ramsay & E. F. Robertson) All simple groups with order from 1 million to 5 million are efficient, Int. J. Group Theory.
**3**(2014), 17-30. - (with Omur Deveci)
*k-nacci*sequences in some special modular groups, Algebra Colloq.**21**(2014), 59-66. - (with B. Ahmadi & H. Doostie) Non-commutative finite monoids of a given order
*n*>= 4, An. St. Univ. Ovidius Constanta**22**(2014), 29-35. - (with M. R. Quick, E. F. Robertson & C. M. Roney-Dougal)(editors) Groups
St Andrews 2013,
London Mathematical Society Lecture Notes in Mathematics
**422**, Cambridge University Press, (Cambridge, 2015). - (with M. R. Sorouhesh and H. Doostie) A sufficient condition for coinciding the Green graphs of semigroups, J. Math. Computer Sci.
**17**(2017), 216-219. - (with M. R. Sorouhesh) Notes on a semigroup related to the dicyclic group Q_n, An. St. Univ. Ovidius Constanta
**25**(2017), 149-157.