@article{DM_1995_7_2_a5,
     author = {B. T. Rumov},
     title = {A lower bound for the cardinality of a class of cyclic difference families},
     journal = {Diskretnaya Matematika},
     pages = {79--87},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1995_7_2_a5/}
}