Lobachevskii Journal of Mathematics
Lobachevskii Journal of Mathematics > 2019 > 40 > 4 > 499-506
Lobachevskii Journal of Mathematics > 2019 > 40 > 4 > 459-468
Lobachevskii Journal of Mathematics > 2019 > 40 > 4 > 489-498
Lobachevskii Journal of Mathematics > 2019 > 40 > 4 > 513-524
Lobachevskii Journal of Mathematics > 2019 > 40 > 4 > 425-438
Lobachevskii Journal of Mathematics > 2019 > 40 > 4 > 469-478
Lobachevskii Journal of Mathematics > 2019 > 40 > 4 > 439-447
Lobachevskii Journal of Mathematics > 2019 > 40 > 4 > 448-458
Lobachevskii Journal of Mathematics > 2019 > 40 > 4 > 507-512
Lobachevskii Journal of Mathematics > 2019 > 40 > 4 > 479-488
Lobachevskii Journal of Mathematics > 2019 > 40 > 4 > 400-414
Lobachevskii Journal of Mathematics > 2019 > 40 > 4 > 415-424
Lobachevskii Journal of Mathematics > 2019 > 40 > 4 > 385-399