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@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/} }
B. T. Rumov. Difference families, difference matrices, and BIB-designs. Matematičeskie zametki, Tome 38 (1985) no. 6, pp. 888-899. http://geodesic.mathdoc.fr/item/MZM_1985_38_6_a9/