@article{NSJOM_1997_27_1a_9,
     author = {U\v{s}an 

 Janez},
     title = {On 

 congruences on n-groups},
     journal = {Novi Sad Journal of Mathematics},
     pages = {89-100},
     year = {1997},
     volume = {27},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1997_27_1a_9/}
}