no. 3
Covering morphisms and normal extensions in Galois structures associated with torsion theories
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 50 (2009) no. 3, article no. 1, 18 p. 
@article{CTGDC_2009__50_3_171_0,
     author = {Gran, Marino and Janelidze, George},
     title = {Covering morphisms and normal extensions in {Galois} structures associated with torsion theories},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     eid = {1},
     pages = {171--188},
     publisher = {Andr\'ee CHARLES EHRESMANN},
     volume = {50},
     number = {3},
     year = {2009},
     mrnumber = {2553538},
     zbl = {1197.18007},
     language = {en},
     url = {http://archive.numdam.org/item/CTGDC_2009__50_3_171_0/}
}
TY  - JOUR
AU  - Gran, Marino
AU  - Janelidze, George
TI  - Covering morphisms and normal extensions in Galois structures associated with torsion theories
JO  - Cahiers de Topologie et Géométrie Différentielle Catégoriques
PY  - 2009
SP  - 171
EP  - 188
VL  - 50
IS  - 3
PB  - Andrée CHARLES EHRESMANN
UR  - http://archive.numdam.org/item/CTGDC_2009__50_3_171_0/
LA  - en
ID  - CTGDC_2009__50_3_171_0
ER  - 
%0 Journal Article
%A Gran, Marino
%A Janelidze, George
%T Covering morphisms and normal extensions in Galois structures associated with torsion theories
%J Cahiers de Topologie et Géométrie Différentielle Catégoriques
%D 2009
%P 171-188
%V 50
%N 3
%I Andrée CHARLES EHRESMANN
%U http://archive.numdam.org/item/CTGDC_2009__50_3_171_0/
%G en
%F CTGDC_2009__50_3_171_0
Gran, Marino; Janelidze, George. Covering morphisms and normal extensions in Galois structures associated with torsion theories. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 50 (2009) no. 3, article  no. 1, 18 p. http://archive.numdam.org/item/CTGDC_2009__50_3_171_0/

[A] A. Arkhangel'Skiĭ, Any topological group is a quotient group of a zero-dimensional topological group, Soviet Math. Doklady 23, 1981, 615-618 | MR | Zbl

[BB] F. Borceux and D. Bourn, Mal'cev, Protomodular, Homological and Semi-Abelian Categories, Mathematics and Its Applications, Kluwer, 2004 | MR | Zbl

[BC] F. Borceux and M.M. Clementino, Topological semi-abelian algebras, Advances in Mathematics 190, 2005, 425-453 | MR | Zbl

[BCGR] F. Borceux, M.M. Clementino, M. Gran and L. Sousa, Protolocalisations of homological categories, Journal of Pure and Applied Algebra 212, 2008, 1898-1927 | MR | Zbl

[BorJ] F. Borceux and G. Janelidze, Galois Theories, Cambridge Studies in Advanced Mathematics 72, Cambridge University Press, 2001 | MR | Zbl

[BG] D. Bourn and M. Gran, Torsion theories in homological categories. Journal of Algebra 305, 2006, 18-47 | MR | Zbl

[BouJ] D. Bourn and G. Janelidze, Protomodularity, descent, and semidirect products, Theory and Applications of Categories 4, 1998, 37-46 | EuDML | MR | Zbl

[CJKP] A. Carboni, G. Janelidze, G. M. Kelly, and R. Paré, On localization and stabilization of factorization systems, Applied Categorical Structures 5, 1997, 1-58 | MR | Zbl

[CHK] C. Cassidy, M. Hébert, and G. M. Kelly, Reflective subcategories, localizations, and factorization systems, Journal of Australian Mathematical Society (Series A), 1985, 287-329 | MR | Zbl

[D] S. E. Dickson, A torsion theory for abelian categories, Transactions of the American Mathemetical Society 121, 1966, 223-235 | MR | Zbl

[EG] T. Everaert and M. Gran, Homology of n-fold groupoids, 2009, preprint | MR | Zbl

[G1] M. Gran, Central extensions and internal groupoids in Maltsev categories, Journal of Pure and Applied Algebra 155, 2001, 139-166 | MR | Zbl

[G2] M. Gran, Applications of categorical Galois theory in universal algebra, Fields Institute Communications 43, 2004, 243-280 | MR | Zbl

[GR] M. Gran and V. Rossi, Torsion theories and Galois coverings of topological groups, Journal of Pure and Applied Algebra 208, 2007, 135-151 | MR | Zbl

[J1] G. Janelidze, Pure Galois theory in categories, Journal of Algebra 132, 1990, 270-286 | MR | Zbl

[J2] G. Janelidze, Categorical Galois theory: revision and some recent developments, in: "Galois Connections and Applications", Mathematics and Its Applications 565, Kluwer Academic Publishers B.V., 2004, 139-171 | MR | Zbl

[JK] G. Janelidze and G. M. Kelly, Galois theory and a general notion of a central extension, Journal of Pure and Applied Algebra 97, 1994, 135-161 | MR | Zbl

[JMT1] G. Janelidze, L. Márki, and W. Tholen, Locally semisimple coverings, Journal of Pure and Applied Algebra 128, 1998, 281-289 | MR | Zbl

[JMT2] G. Janelidze, L. Márki, and W. Tholen, Semi-abelian categories, Journal of Pure and Applied Algebra 168, 2002, 367-386 | MR | Zbl

[JMU] G. Janelidze, L. Márki, and A. Ursini, Ideals and clots in universal algebra and in semi-abelian categories, Journal of Algebra 307, 1, 2007, 191-208 | MR | Zbl

[JT] G. Janelidze and W. Tholen, Characterization of torsion theories in general categories, Contemporary Mathematics 431, 2007, 249-256 | MR | Zbl

[L] A. S.-T. Lue, Baer-invariants and extensions relative to a variety, Proceedings of Cambridge Philosophical Society 63, 1967, 569-578 | MR | Zbl

[U] A. Ursini, Osservazioni sulla varietá BIT, Boll. U. M. I. (4) 7, 1973, 205-211 | MR | Zbl