Guides telecommunications system design, construction and maintenance of Tom (part) 2. A textbook for high schools - 7 th ed. , Pererab. and added. - ("Workbook for higher educational institutions") (GRIF) / Napravlyayushchie sistemy elektrosvyazi Proektirovanie, stroitelstvo i tekhnicheskaya expluatatsiya Tom(chast) 2. Uchebnik dlya vuzov - 7-e izd.,pererab. i dop. - ("Uchebnoe posobie dlya vysshikh uchebnykh zavedeniy") (GRIF)