Papers in International Journals

• Gomes, Gracinda M. S.; Gould, Victoria (2008) Fundamental semigroups having a band of idempotents Semigroup Forum: 77, 279-299.

• Gomes, Gracinda M. S.; Maria B. Szendrei (2007) Almost factorizable weakly ample semigroups Communications in Algebra: 35 (11), 3503-3523.

• Branco, Mário J. J. (2007) Deterministic concatenation product of languages recognized by finite idempotent monoids Semigroup Forum: 74, n. 3, 379-409.

• Gomes, Gracinda M. S.; Szendrei, Maria B. (2007) Even covers of left ample semigroups Semigroup Forum: 74(2), 293-305.

• Fountain, John B.; Gomes, Gracinda M. S. (2006) Finite abundant semigroups in which the idempotents form a subsemigroup Journal of Algebra: 295, 303-313.

• Gomes, Gracinda M. S.; Pin, J.-E.; Sezinando, Helena (2006) Presentations of the Schützenberger product of n groups Communications in Algebra: 34 (4), 1213-1235.

• Fountain, J.B.; Gomes, Gracinda M. S. (2006) Proper covers of ample monoids Proc. Edinb. Math. Soc.: 49, 277-289.

• Gomes, Gracinda M. S. (2006) The generalized prefix expansion of a weakly left ample semigroup Semigroup Forum: 72 (3), 387-403.

• Branco, Mário J. J. (2006) Two algebraic approaches to variants of the concatenation product Theoret. Comput. Sci.: 369, 406-426.

• Fernandes, Vítor Hugo; Gomes, Gracinda M. S.; Jesus, Manuel M. (2005) Congruences on monoids of order-preserving or order-reversing transformations on a finite chain Glasgow Mathematical Journal: 47, 413-424.

• Fernandes, Vítor Hugo; Gomes, Gracinda M. S.; Jesus, Manuel M. (2005) Presentations for some monoids of partial transformations on a finite chain Communications in Algebra: 33, 587-604.

• Gomes, Gracinda M. S. (2005) Proper extensions of weakly left ample semigroups Acta Math Hungarica: 109 (1-2), 33-51.

• Auinger, K.; Gomes, Gracinda M. S.; Gould, V.; Steinberg, B. (2004) An application of a theorem of Ash to finite proper cover Studia Logica: 78, 45-57.

• Santa-Clara, Catarina; Smith, Patrick F. (2004) Direct Products of Simple Modules Over Dedekind Domains Archiv der Mathematik: 82, 8-12.

• Gouveia, M. J.; (previously Saramago, M. J.) (2004) Optimal natural dualities: the role of endomorphisms J. Australian Math. Soc.: 77, 269-296.

• Fernandes, Vítor Hugo; Gomes, Gracinda M. S.; Jesus, Manuel M. (2004) Presentations for Some Monoids of Injective Partial Transformations on a Finite Chain Southeast Asian Bulletin of Mathematics: 28, 903-918.

• Gomes, Gracinda M. S.; Gould, V. (2003) Finite proper covers in a class of finite semigroups with commuting idempotents Semigroup Forum: 66, 433-454.

• Gouveia, M. J.; (previously Saramago, M. J.); Priestley, H. A. (2002) Optimal natural dualities: the structure of failsets Internat. J. Algebra and Computation: 12 (3), 407-436.

• Gomes, Gracinda M. S.; Gould, Victoria (2001) Fundamental Ehresmann Semigroups Semigroup Forum: 63 (1), 11-33.

• Araújo, Isabel M.; Branco, Mário J. J.; Fernandes, Vítor Hugo; Gomes, Gracinda M. S.; Ruskuc, N. (2001) On generators and relations for unions of semigroups Semigroup Forum: 63 (1), 49-62.

• Gomes, Gracinda M. S.; Gould, Victoria (2000) Graph expansions of unipotent monoids Comm. Algebra: 28 (1), 447-463.

• Santa-Clara, Catarina; Smith, Patrick F. (2000) Modules which are self-injective relative to closed submodules Contemp. Math.: 259, 487-499.

• Giraldes, Emília; Gomes, Gracinda M. S.; McAlister, D. B. (2000) On a class of lattice ordered inverse semigroups J. Algebra: 230, 496-517.

• Fountain, John; Gomes, Gracinda M. S. (2000) Primitive inverse congruences on categorical semigroups Proc. Edinburgh Math. Soc.: 43, 395-413.

• Gouveia, M. J.; (previously Saramago, M. J.) (2000) Some remarks on dualisability and endodualisability Algebra Universalis: 43, 197-212.

• Fountain, John; Gomes, Gracinda M. S.; Gould, Victoria (1999) A Munn type representation for a class of E-semiadequate semigroups J. Algebra: 218, 693-714.

• Fountain, John; Gomes, Gracinda M. S.; Gould, Victoria (1999) Enlargements, semiabundancy and unipotent monoids Comm. Algebra: 27 (2), 595-614.

• Gomes, Gracinda M. S.; Gould, Victoria (1999) Proper weakly left ample semigroups Internat. J. Algebra Comput.: 9 (6), 721-739.

• Santa-Clara, Catarina (1998) Extending modules with injective or semisimple summands J. Pure Applied Algebra: 127, 193-203.

• Gomes, Gracinda M. S.; Szendrei, Mária B. (1998) Idempotent pure extensions of inverse semigroups via quivers J. Pure Applied Algebra: 127, 15-38.

• Santa-Clara, Catarina; Silva, F. C. (1998) On infinite Goldie dimension J. Algebra: 205, 617-625.

• Gouveia, M. J.; (previously Saramago, M. J.) (1998) Optimal natural dualities for some quasivarieties of distributive double p-algebras Acta Math. Univ. Comenianae: 67, 249-272.

• Gomes, Gracinda M. S.; Howie, John M. (1998) Semigroups with zero whose idempotents form a subsemigroup Proc. Royal Soc. Edinburgh: 128A, 265-281.

• Branco, Mário J. J. (1997) The Kernel Category and Variants of the Concatenation Product Internat. J. Algebra Comput.: 7, 487-509.

• Gomes, Gracinda M. S.; Howie, John M. (1996) A P-theorem for inverse semigroups with zero Portugaliae Math.: 53 (3), 257-278.

• Santa-Clara, Catarina; Smith, Patrick F. (1996) Extending modules which are direct sums of injective modules and semisimple modules Comm. Algebra: 24 (11), 3641-3651.

• Gomes, Gracinda M. S.; Howie, John M. (1995) Idempotent endomorphisms of an independence algebra of finite rank Proc. Edinb. Math. Soc.: 38, 107-116.

• Branco, Mário J. J. (1994) On the Pin-Thérien Expansion of Idempotent Monoids Semigroup Forum: 49, 329-334.

• Fountain, John; Gomes, Gracinda M. S. (1994) Proper left type-A covers Portugaliae Math.: 51 (4), 305-319.

• Gomes, Gracinda M. S. (1993) A characterisation of the group congruences on a semigroup Semigroup Forum: 46, 48-53.

• Fountain, J.B.; Gomes, Gracinda M. S. (1993) Proper left type-A monoids revisited Glasgow Math. J.: 35, 293-306.

• Gomes, Gracinda M. S. (1992) Group congruences on eventually inverse semigroup Portugal. Math.: 49 (4), 417-428.

• Fountain, J.B.; Gomes, Gracinda M. S. (1992) Left proper E-dense monoids J. Pure Appl. Algebra: 80, 1-27.

• Gomes, Gracinda M. S.; Howie, J.M. (1992) On the ranks of certain semigroups of order-preserving transformations Semigroup Forum: 45, 272-282.

• Fountain, J.B.; Gomes, Gracinda M. S. (1990) The Szendrei expansion of a semigroup Mathematika: 37, 251-260.

• Gomes, Gracinda M. S. (1988) Orthodox congruences on regular semigroups Semigroup Forum: 37, 149-166.

• Gomes, Gracinda M. S.; Howie, J.M. (1987) Nilpotents in finite symmetric inverse semigroups Proc. Edinburgh Math. Soc.: 30, 383-395.

• Gomes, Gracinda M. S.; Howie, J.M. (1987) On the ranks of certain finite semigroups of transformations Math. Proc. Cambridge Philos. Soc.: 101, 395-403.

• Gomes, Gracinda M. S. (1986) Some results on congruences on R-unipotent semigroups Semigroup Forum: 33, 175-185.

• Gomes, Gracinda M. S. (1986) The lattice of R-unipotent congruences on a regular semigroup Semigroup Forum: 33, 159-173.