@article{MZM_1985_38_6_a9,
     author = {B. T. Rumov},
     title = {Difference families, difference matrices, and {BIB-designs}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {888--899},
     publisher = {mathdoc},
     volume = {38},
     number = {6},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1985_38_6_a9/}
}