Перепелица, Станислав Анатольевич. Системы и сети связи [Электронный ресурс]: методическое руководство к лабораторным работам / С. А. Перепелица, Н. В. Богач. — Электрон. дан. (1 файл : 387 Кб). — СПб., 2011. — Загл. с титул. экрана. — Свободный доступ из сети Интернет (чтение). — Adobe Acrobat Reader 6.0. — <URL:http://elib.spbstu.ru/dl/2251.pdf>.
| Period | Read | Copy | Open | Total | ||
|---|---|---|---|---|---|---|
| Year 2012 | Quarter 4 | 0 | 0 | 55 | 0 | 55 |
| Year 2013 | Quarter 1 | 1 | 0 | 19 | 0 | 20 |
| Quarter 2 | 48 | 0 | 20 | 0 | 68 | |
| Quarter 3 | 37 | 0 | 10 | 0 | 47 | |
| Quarter 4 | 19 | 0 | 5 | 0 | 24 | |
| Year 2014 | Quarter 1 | 12 | 0 | 8 | 0 | 20 |
| Quarter 2 | 18 | 0 | 59 | 0 | 77 | |
| Quarter 3 | 22 | 0 | 26 | 0 | 48 | |
| Quarter 4 | 16 | 0 | 16 | 0 | 32 | |
| Year 2015 | Quarter 1 | 13 | 0 | 4 | 0 | 17 |
| Quarter 2 | 20 | 0 | 9 | 0 | 29 | |
| Quarter 3 | 18 | 0 | 10 | 0 | 28 | |
| Quarter 4 | 15 | 0 | 14 | 0 | 29 | |
| Year 2016 | Quarter 1 | 21 | 0 | 9 | 0 | 30 |
| Quarter 2 | 12 | 0 | 14 | 0 | 26 | |
| Quarter 3 | 10 | 0 | 7 | 0 | 17 | |
| Quarter 4 | 16 | 0 | 14 | 0 | 30 | |
| Year 2017 | Quarter 1 | 11 | 0 | 5 | 0 | 16 |
| Quarter 2 | 11 | 0 | 52 | 0 | 63 | |
| Quarter 3 | 14 | 0 | 59 | 0 | 73 | |
| Quarter 4 | 8 | 0 | 38 | 0 | 46 | |
| Year 2018 | Quarter 1 | 6 | 0 | 65 | 0 | 71 |
| Quarter 2 | 7 | 0 | 124 | 0 | 131 | |
| Quarter 3 | 11 | 0 | 148 | 0 | 159 | |
| Quarter 4 | 11 | 0 | 102 | 0 | 113 | |
| Year 2019 | Quarter 1 | 8 | 0 | 132 | 0 | 140 |
| Quarter 2 | 6 | 0 | 169 | 0 | 175 | |
| Quarter 3 | 6 | 0 | 65 | 0 | 71 | |
| Quarter 4 | 1 | 0 | 184 | 0 | 185 | |
| Year 2020 | Quarter 1 | 15 | 0 | 58 | 0 | 73 |
| Quarter 2 | 8 | 0 | 1 | 0 | 9 | |
| Quarter 3 | 8 | 0 | 0 | 0 | 8 | |
| Quarter 4 | 4 | 0 | 48 | 0 | 52 | |
| Year 2021 | Quarter 1 | 3 | 0 | 219 | 0 | 222 |
| Quarter 2 | 13 | 0 | 361 | 0 | 374 | |
| Quarter 3 | 4 | 0 | 151 | 0 | 155 | |
| Quarter 4 | 7 | 0 | 265 | 0 | 272 | |
| Year 2022 | Quarter 1 | 4 | 0 | 243 | 0 | 247 |
| Quarter 2 | 4 | 0 | 245 | 0 | 249 | |
| Quarter 3 | 6 | 0 | 125 | 0 | 131 | |
| Quarter 4 | 22 | 0 | 261 | 0 | 283 | |
| Year 2023 | Quarter 1 | 6 | 0 | 184 | 0 | 190 |
| Quarter 2 | 8 | 0 | 158 | 0 | 166 | |
| Quarter 3 | 3 | 0 | 114 | 0 | 117 | |
| Quarter 4 | 8 | 0 | 182 | 0 | 190 | |
| Year 2024 | Quarter 1 | 3 | 0 | 189 | 0 | 192 |
| Quarter 2 | 17 | 0 | 198 | 0 | 215 | |
| Quarter 3 | 14 | 0 | 120 | 0 | 134 | |
| Quarter 4 | 11 | 0 | 177 | 0 | 188 | |
| Year 2025 | Quarter 1 | 26 | 0 | 131 | 0 | 157 |
| Quarter 2 | 15 | 0 | 167 | 0 | 182 | |
| Quarter 3 | 0 | 0 | 11 | 0 | 11 | |
| Total | 607 | 0 | 5,050 | 0 | 5,657 | |