@article{MZM_1990_47_3_a1,
     author = {G. A. Bekishev},
     title = {Hadamard matrices and difference families},
     journal = {Matemati\v{c}eskie zametki},
     pages = {11--16},
     publisher = {mathdoc},
     volume = {47},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_47_3_a1/}
}