Voir la notice de l'article provenant de la source Novi sad journal of mathematics website
@article{NSJOM_2002_32_2a_3, author = {Gh. Ivan}, title = {Special morphism of groupoids}, journal = {Novi Sad Journal of Mathematics}, pages = {23-36}, publisher = {mathdoc}, volume = {32}, number = {2}, year = {2002}, url = {http://geodesic.mathdoc.fr/item/NSJOM_2002_32_2a_3/} }
Gh. Ivan. Special morphism of groupoids. Novi Sad Journal of Mathematics, Tome 32 (2002) no. 2. http://geodesic.mathdoc.fr/item/NSJOM_2002_32_2a_3/