Гельгор, Александр Леонидович. Общая теория связи. Проверка статистических гипотез. Оценивание параметров. Оптимальный приём сигналов [Электронный ресурс]: учебное пособие для вузов по направлению подготовки магистров "Техническая физика" / А.Л. Гельгор, А.И. Горлов, Е.А. Попов; Санкт-Петербургский государственный политехнический университет. — Электрон. текстовые дан. (1 файл : 1,85 Мб). — Санкт-Петербург, 2013. — Загл. с титул. экрана. — Электронная версия печатной публикации. — Свободный доступ из сети Интернет (чтение, печать, копирование). — Текстовый документ. — Adobe Acrobat Reader 7.0. — <URL:http://elib.spbstu.ru/dl/2/3057.pdf>.
| Period | Read | Copy | Open | Total | ||
|---|---|---|---|---|---|---|
| Year 2013 | Quarter 2 | 9 | 0 | 29 | 0 | 38 |
| Quarter 3 | 0 | 0 | 12 | 0 | 12 | |
| Quarter 4 | 15 | 0 | 56 | 0 | 71 | |
| Year 2014 | Quarter 1 | 36 | 0 | 37 | 0 | 73 |
| Quarter 2 | 43 | 0 | 33 | 0 | 76 | |
| Quarter 3 | 25 | 0 | 13 | 0 | 38 | |
| Quarter 4 | 30 | 0 | 36 | 0 | 66 | |
| Year 2015 | Quarter 1 | 24 | 0 | 56 | 0 | 80 |
| Quarter 2 | 23 | 0 | 15 | 0 | 38 | |
| Quarter 3 | 23 | 0 | 15 | 0 | 38 | |
| Quarter 4 | 28 | 0 | 33 | 0 | 61 | |
| Year 2016 | Quarter 1 | 33 | 0 | 29 | 0 | 62 |
| Quarter 2 | 25 | 0 | 24 | 0 | 49 | |
| Quarter 3 | 13 | 0 | 21 | 0 | 34 | |
| Quarter 4 | 36 | 0 | 112 | 0 | 148 | |
| Year 2017 | Quarter 1 | 12 | 0 | 53 | 0 | 65 |
| Quarter 2 | 32 | 0 | 113 | 0 | 145 | |
| Quarter 3 | 10 | 0 | 92 | 0 | 102 | |
| Quarter 4 | 25 | 0 | 249 | 0 | 274 | |
| Year 2018 | Quarter 1 | 12 | 0 | 200 | 0 | 212 |
| Quarter 2 | 18 | 0 | 267 | 0 | 285 | |
| Quarter 3 | 21 | 0 | 235 | 0 | 256 | |
| Quarter 4 | 21 | 0 | 263 | 0 | 284 | |
| Year 2019 | Quarter 1 | 13 | 0 | 155 | 0 | 168 |
| Quarter 2 | 15 | 0 | 176 | 0 | 191 | |
| Quarter 3 | 8 | 0 | 164 | 0 | 172 | |
| Quarter 4 | 3 | 0 | 227 | 0 | 230 | |
| Year 2020 | Quarter 1 | 13 | 0 | 61 | 0 | 74 |
| Quarter 2 | 53 | 0 | 1 | 0 | 54 | |
| Quarter 3 | 33 | 1 | 4 | 0 | 38 | |
| Quarter 4 | 22 | 0 | 37 | 0 | 59 | |
| Year 2021 | Quarter 1 | 26 | 0 | 84 | 0 | 110 |
| Quarter 2 | 21 | 0 | 94 | 0 | 115 | |
| Quarter 3 | 10 | 0 | 43 | 0 | 53 | |
| Quarter 4 | 11 | 0 | 86 | 0 | 97 | |
| Year 2022 | Quarter 1 | 6 | 0 | 109 | 0 | 115 |
| Quarter 2 | 23 | 0 | 113 | 0 | 136 | |
| Quarter 3 | 22 | 0 | 75 | 0 | 97 | |
| Quarter 4 | 29 | 0 | 82 | 0 | 111 | |
| Year 2023 | Quarter 1 | 16 | 0 | 60 | 0 | 76 |
| Quarter 2 | 10 | 0 | 84 | 0 | 94 | |
| Quarter 3 | 15 | 0 | 79 | 0 | 94 | |
| Quarter 4 | 13 | 0 | 118 | 0 | 131 | |
| Year 2024 | Quarter 1 | 8 | 0 | 91 | 0 | 99 |
| Quarter 2 | 24 | 0 | 162 | 0 | 186 | |
| Quarter 3 | 12 | 1 | 122 | 0 | 135 | |
| Quarter 4 | 11 | 0 | 156 | 0 | 167 | |
| Year 2025 | Quarter 1 | 25 | 0 | 159 | 0 | 184 |
| Quarter 2 | 24 | 1 | 154 | 0 | 179 | |
| Quarter 3 | 12 | 0 | 21 | 0 | 33 | |
| Total | 992 | 3 | 4,710 | 0 | 5,705 | |