| 1 |  | SPC digital telephone exchanges / F.J. Redmill and A.R. Valdar . - London, U.K. : Peter Peregrinus on behalf of the Institution of Electrical Engineers, 1990. - xi, 497 p. : ill. ; 24 cm. |
| 2 | | SPC digital telephone exchanges / F.J. Redmill and A.R. Valdar . - London, U.K. : Peter Peregrinus on behalf of the Institution of Electrical Engineers, c1990. - xi, 497 p. : ill. ; 24 cm.
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| 3 | | Telecommunications network management into the 21st century : techniques, standards, technologies, and applications / edited by Salah Aidarous, Thomas Plevyak . - New York : IEEE Press, 1994. - xxii, 426 p. : ill. ; 24 cm.
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