Гольдштейн, Борис Соломонович. Системы коммутации: учебник / Б. С. Гольдштейн; Санкт-Петербургский государственный университет телекоммуникаций им. проф. М. А. Бонч-Бруевича. — 2 изд. — Санкт-Петербург: БХВ-Петербург, 2021. — 314 с. — Доступ по паролю из сети Интернет (чтение). — <URL:https://znanium.com/catalog/document?id=391688>. — <URL:https://znanium.com/cover/1856/1856771.jpg>. — Текст: электронный
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| Year 2023 | Quarter 2 | May | 0 | 0 | 0 | 1 | 1 |
| June | 0 | 0 | 0 | 0 | 0 | ||
| Quarter 3 | July | 0 | 0 | 0 | 2 | 2 | |
| August | 0 | 0 | 0 | 1 | 1 | ||
| September | 0 | 0 | 0 | 3 | 3 | ||
| Quarter 4 | October | 0 | 0 | 0 | 1 | 1 | |
| November | 0 | 0 | 0 | 1 | 1 | ||
| December | 0 | 0 | 0 | 2 | 2 | ||
| Year 2024 | Quarter 1 | January | 0 | 0 | 0 | 0 | 0 |
| February | 0 | 0 | 0 | 0 | 0 | ||
| March | 0 | 0 | 0 | 0 | 0 | ||
| Quarter 2 | April | 0 | 0 | 0 | 0 | 0 | |
| May | 0 | 0 | 0 | 0 | 0 | ||
| June | 0 | 0 | 0 | 1 | 1 | ||
| Quarter 3 | July | 0 | 0 | 0 | 1 | 1 | |
| August | 0 | 0 | 0 | 1 | 1 | ||
| September | 0 | 0 | 0 | 2 | 2 | ||
| Quarter 4 | October | 0 | 0 | 0 | 0 | 0 | |
| November | 0 | 0 | 0 | 0 | 0 | ||
| Total | 0 | 0 | 0 | 16 | 16 | ||