Publications
    Papers:
    1. Epireflections in the category of topological groups, Rendiconti di Matematica (4) 1981, Vol. 1, serie VII, 609-617
    2. On systems of cogenerators for epireflective subcategories, with A. Tozzi, Riv. Mat. Univ. Parma (4) 9 (1983) 373-377
    3. Epireflections versus bireflections for topological functors, Quaest. Math., 8 (1) 1985, 47-61
    4. Closure operators, monomorphisms and epimorphisms in categories of groups, Cahiers Topologie Geom. Differentielle Categoriques, Vol. XXVII-2 (1986) 151-167
    5. Closure operators and functorial topologies, J. Pure Appl. Algebra 55 (1988) 251-259
    6. Compact objects, surjectivity of epimorphisms and compactifications, Cahiers Topologie Geom. Differentielle Categoriques, Vol XXXI-1 (1990) 53-65
    7. Global closure operators versus subcategories, with G. E. Strecker, Quaest. Math. 13 (3&4) (1990) 417-424
    8. A factorization of the Pumplün-Röhrl connection, with J. Koslowski and G. E. Strecker, Topology and its Appl. 44 (1992) 69-76
    9. Regular closure operators and compactness, Cahiers Topologie Geom. Differentielle Categoriques Vol. XXXIII-1 (1992) 21-31
    10. Hereditarity of closure operators and injectivity, with E.Giuli, Comment. Math. Univ. Carol. 33, 1 (1992) 149-157
    11. Hereditary and modal closure operators, with J. Koslowski and G. E. Strecker, Category Theory 1991, Proceedings of the Summer International Meeting in Montreal (Montreal, Canada, June 1991 ), C.M.S Conference Proceedings, AMS (1992) 111-132
    12. Categorical closure operators via Galois connections, with J. Koslowski and G. E. Strecker, Recent Developments of General Topology and its Applications, International Conference in Memory of Felix Hausdorff (1868-1942), Mathematical Research 67, Akademie Verlag, Berlin (1992) 72-79
    13. Epimorphisms in categories of separated fuzzy topological spaces,
      with I. Alderton, Fuzzy Sets and Systems 56 (1993) 323-330
    14. Closure operators and polarities, with J. Koslowski and G. E. Strecker, Proceedings of the 1991 Summer Conference on General Topology and its Applications (Madison, Wisconsin, June 1991 ) Annals of the New York Academy of Sciences, Vol. 704 (1993) 38-52
    15. Closure operators and connectedness, with D. Hajek, Topology and its Appl. 55 (1994) 29-45
    16. Regular closure operators, with J. Koslowski and G. E. Strecker, Journal of Applied Categorical Structures 2 (1994) 219-244
    17. An approach to a dual of regular closure operators, with J. Koslowski and G. E. Strecker, Cahiers Topologie Geom. Differentielle Categoriques Vol. XXXV-2 (1994) 109-128
    18. Connectedness, disconnectedness and closure operators, a more general approach, Proceedings of the Workshop on Categorical Topology (L'Aquila 1994), Kluwer Academic Publishers (1996) 129-138
    19. Connectedness, disconnectedness and closure operators: Further results, Quaest. Math. 20 (4) (1997) 611-638
    20. Connectedness and disconnectedness: a different perspective, Quaest. Math. 21 (1\&2) (1998) 117-133
    21. Closure operators and fuzzy connectedness, with I. W. Alderton, Fuzzy Sets and Systems 104 (3) (1999) 397-405
    22. Connectedness classes, Quaest. Math. 23 (3) (2000) 313-334.
    23. Disconnectedness classes, Quaest. Math. 24 (1) (2001) 75-92.
    24. Categorical closure operators, Categorical Perspectives, Trends in Mathematics Series, Birkhäuser Boston (2001) 109-150.
    25. Connectedness with respect to a closure operator, Journal of Applied Categorical Structures 9 (2001) 285-301
    26. Closure operators with respect to a functor, with E. Giuli, Journal of Applied Categorical Structures 9 (2001) 525-537
    27. A link between two connectedness notions, with D. Holgate, Journal of Applied Categorical Structures 11 (2003) 473-486
    28. Closure operator constructions depending on one parameter, with D. Holgate, Quaest. Math. 26(3) (2003) 289-305
    29. U-Closure Operators and Compactness, with E. Giuli, Journal of Applied Categorical Structures 13 (2005) 453-467
    30. T1 Separation in a category, Quaestiones Mathematicae 29 (2006) 151-170
    31. Discrete objects, splitting closure and connectedness, Quaestiones Mathematicae 31 (2008) 1-20
    32. A categorical approach to absolute closure, with D. Holgate, Acta Mathematica Hungarica 126(4) (2010) 295-314
    33. Interior Operators and Topological Connectedness, with J. Ramos, Quaest. Math. 33 (2010) 290-304
    34. Interior operators in a category: idempotency and heredity, Topology Appl., 158 (2011) 2332-2339
    35. Interior operators and topological separation, with E. Murcia, Topology Appl., 160 (2013) 1476-1485
    36. Interior operators, open morphisms and the preservation property, Journal of Applied Categorical structures (to appear)
    37. A diagram of Galois connections of functorial topologies, with S. Dziobiak (submitted)

    Books: