Voir la notice de l'article provenant de la source Novi sad journal of mathematics website
@article{NSJOM_2005_35_2a_12, author = {J. U\v{s}an}, title = {A comment on $(n,m)-$groups}, journal = {Novi Sad Journal of Mathematics}, pages = {133-141}, publisher = {mathdoc}, volume = {35}, number = {2}, year = {2005}, url = {http://geodesic.mathdoc.fr/item/NSJOM_2005_35_2a_12/} }
J. Ušan. A comment on $(n,m)-$groups. Novi Sad Journal of Mathematics, Tome 35 (2005) no. 2. http://geodesic.mathdoc.fr/item/NSJOM_2005_35_2a_12/