@article{TRSPY_1934_5_a9,
     author = {I. M. Vinogradov},
     title = {Some theorems on the distribution of indices and primitive roots},
     journal = {Informatics and Automation},
     pages = {87--93},
     publisher = {mathdoc},
     volume = {5},
     year = {1934},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1934_5_a9/}
}