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3. Connecting service provider networks to backbone clock synchronization networks. Industry recommendations N P 45.09-2001, 5.11-2001. Ministry of Communications and Informatization of the Russian Federation.
4. Freeman R. Fiber Optic Systems for Telecommunications// Translation from English / Under the redaction of Slepov N.N. – Moscow: Technosphere, 2007. – p. 512
5. ITU-T G.810: Definitions and terminology for synchronization networks (8.96)