T︠S︡ifrovye sistemy peredachi abonentskikh liniĭ /
Sitni︠a︡kovskiĭ, I. V.(Igorʹ Vladimirovich)
Erickson, John,1929-2002,former owner.StEdNL
Erickson, Ljubica,former owner.StEdNL
Porokhov, O. N.(Oleg Nikolaevich)
Nekhaev, A. L.(Aleksandr Lʹvovich)
Moskva : "Radio i svi︠a︡zʹ",
1987.
Bibliography: p. 208-213.
John and Ljubica Erickson collection.
Digital communications.