Lichko, K.P. Agricultural regioning of the Russian Federation / K. P. Lichko, A. Voronina, N. Mitrofanov. — с.34-43. — Электрон. текстовые дан. // Izvestia of Timiryazev - Academy: Scientific-theoretical Journal of the Russian State Agrarian University - Moscow Agricultural Academy named after K.A. Timiryazev. – 2010. – Вып. special issue. — Коллекция: Журнал «Известия ТСХА». — http://elib.timacad.ru/dl/full/03-2010-eng.pdf. - Загл. с титул. экрана. — <URL:http://elib.timacad.ru/dl/full/03-2010-eng.pdf>.
| Period | Read | Copy | Open | Total | |
|---|---|---|---|---|---|
| Year 2017 | 12 | 0 | 8 | 0 | 20 |
| Year 2018 | 36 | 0 | 23 | 0 | 59 |
| Year 2019 | 29 | 0 | 25 | 0 | 54 |
| Year 2020 | 14 | 0 | 10 | 0 | 24 |
| Year 2021 | 36 | 0 | 30 | 0 | 66 |
| Year 2022 | 26 | 0 | 22 | 0 | 48 |
| Year 2023 | 19 | 0 | 26 | 0 | 45 |
| Year 2024 | 45 | 0 | 48 | 0 | 93 |
| Year 2025 | 151 | 0 | 101 | 0 | 252 |
| Year 2026 | 118 | 0 | 96 | 0 | 214 |
| Total | 486 | 0 | 389 | 0 | 875 |