Coverings and ring-groupoids.
Mucuk, Osman
Georgian Mathematical Journal, Tome 5 (1998), p. 475-482 / Harvested from The Electronic Library of Mathematics
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Publié le : 1998-01-01
DOI : https://doi.org/10.1023/B:GEOR.0000008118.11447.b2
EUDML-ID : urn:eudml:doc:48189 
@article{01234899,
     title = {Coverings and ring-groupoids.},
     journal = {Georgian Mathematical Journal},
     volume = {5},
     year = {1998},
     pages = {475-482},
     doi = {10.1023/B:GEOR.0000008118.11447.b2},
     zbl = {0918.22002},
     language = {en},
     url = {http://dml.mathdoc.fr/item/01234899}
}

Mucuk, Osman. Coverings and ring-groupoids.. Georgian Mathematical Journal, Tome 5 (1998) pp. 475-482. doi : 10.1023/B:GEOR.0000008118.11447.b2. http://gdmltest.u-ga.fr/item/01234899/