Voir la notice de l'article provenant de la source Novi sad journal of mathematics website
@article{NSJOM_1990_20_2a_5, author = {Mashour A. S. and Ghanim M. H. and Sidky F. I.}, title = {Normal fuzzy subgroups}, journal = {Novi Sad Journal of Mathematics}, pages = {53-59}, publisher = {mathdoc}, volume = {20}, number = {2}, year = {1990}, url = {http://geodesic.mathdoc.fr/item/NSJOM_1990_20_2a_5/} }
Mashour A. S.; Ghanim M. H.; Sidky F. I. Normal fuzzy subgroups. Novi Sad Journal of Mathematics, Tome 20 (1990) no. 2. http://geodesic.mathdoc.fr/item/NSJOM_1990_20_2a_5/