Попова, Светлана Владимировна. Математическая логика [Электронный ресурс]: учебное пособие для вузов по направлению подготовки магистров "Системный анализ и управление" / С.В. Попова, И.А. Ходырев; Санкт-Петербургский государственный политехнический университет. — Электрон. текстовые дан. (1 файл : 1,36 Мб). — Санкт-Петербург, 2010. — Загл. с титул. экрана. — Свободный доступ из сети Интернет (чтение, печать). — Текстовый документ. — Adobe Acrobat Reader 7.0. — <URL:http://elib.spbstu.ru/dl/2914.pdf>.
| Period | Read | Copy | Open | Total | ||
|---|---|---|---|---|---|---|
| Year 2013 | Quarter 1 | 5 | 0 | 1 | 0 | 6 |
| Quarter 2 | 26 | 0 | 7 | 0 | 33 | |
| Quarter 3 | 13 | 0 | 6 | 0 | 19 | |
| Quarter 4 | 12 | 0 | 7 | 0 | 19 | |
| Year 2014 | Quarter 1 | 22 | 0 | 9 | 0 | 31 |
| Quarter 2 | 25 | 0 | 8 | 0 | 33 | |
| Quarter 3 | 17 | 0 | 10 | 0 | 27 | |
| Quarter 4 | 20 | 0 | 7 | 0 | 27 | |
| Year 2015 | Quarter 1 | 19 | 0 | 2 | 0 | 21 |
| Quarter 2 | 16 | 0 | 4 | 0 | 20 | |
| Quarter 3 | 15 | 0 | 12 | 0 | 27 | |
| Quarter 4 | 8 | 0 | 6 | 0 | 14 | |
| Year 2016 | Quarter 1 | 16 | 0 | 15 | 0 | 31 |
| Quarter 2 | 25 | 0 | 18 | 0 | 43 | |
| Quarter 3 | 10 | 0 | 3 | 0 | 13 | |
| Quarter 4 | 15 | 0 | 9 | 0 | 24 | |
| Year 2017 | Quarter 1 | 9 | 0 | 1 | 0 | 10 |
| Quarter 2 | 9 | 0 | 14 | 0 | 23 | |
| Quarter 3 | 13 | 0 | 36 | 0 | 49 | |
| Quarter 4 | 11 | 0 | 49 | 0 | 60 | |
| Year 2018 | Quarter 1 | 13 | 0 | 97 | 0 | 110 |
| Quarter 2 | 6 | 0 | 92 | 0 | 98 | |
| Quarter 3 | 14 | 0 | 43 | 0 | 57 | |
| Quarter 4 | 5 | 0 | 49 | 0 | 54 | |
| Year 2019 | Quarter 1 | 7 | 0 | 36 | 0 | 43 |
| Quarter 2 | 4 | 0 | 74 | 0 | 78 | |
| Quarter 3 | 7 | 0 | 39 | 0 | 46 | |
| Quarter 4 | 1 | 0 | 179 | 0 | 180 | |
| Year 2020 | Quarter 1 | 8 | 0 | 67 | 0 | 75 |
| Quarter 2 | 12 | 0 | 1 | 0 | 13 | |
| Quarter 3 | 14 | 0 | 0 | 0 | 14 | |
| Quarter 4 | 10 | 0 | 24 | 0 | 34 | |
| Year 2021 | Quarter 1 | 12 | 0 | 71 | 0 | 83 |
| Quarter 2 | 9 | 0 | 127 | 0 | 136 | |
| Quarter 3 | 5 | 0 | 198 | 0 | 203 | |
| Quarter 4 | 8 | 0 | 466 | 0 | 474 | |
| Year 2022 | Quarter 1 | 8 | 0 | 365 | 0 | 373 |
| Quarter 2 | 3 | 0 | 323 | 0 | 326 | |
| Quarter 3 | 11 | 0 | 280 | 0 | 291 | |
| Quarter 4 | 17 | 0 | 495 | 0 | 512 | |
| Year 2023 | Quarter 1 | 16 | 0 | 636 | 0 | 652 |
| Quarter 2 | 9 | 0 | 555 | 0 | 564 | |
| Quarter 3 | 12 | 0 | 518 | 0 | 530 | |
| Quarter 4 | 9 | 0 | 1,173 | 0 | 1,182 | |
| Year 2024 | Quarter 1 | 13 | 0 | 1,354 | 0 | 1,367 |
| Quarter 2 | 26 | 0 | 1,540 | 0 | 1,566 | |
| Quarter 3 | 21 | 0 | 929 | 0 | 950 | |
| Quarter 4 | 114 | 0 | 2,297 | 0 | 2,411 | |
| Year 2025 | Quarter 1 | 45 | 1 | 1,758 | 0 | 1,804 |
| Quarter 2 | 54 | 0 | 1,665 | 0 | 1,719 | |
| Quarter 3 | 13 | 0 | 84 | 0 | 97 | |
| Total | 812 | 1 | 15,759 | 0 | 16,572 | |