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3. Federal Target Program Global Navigation System JSC “Russian Space Systems”:http://www.spacecorp.ru/directions/glonass/politics/.
4. StorozhevV. “GLONASS orbital constellation maintaining program for the period until 2020 ” 18th International Conference on System Analysis Control and Navigation Evpatoria June 30–July 7 2013.
5. Posterior Precise Orbits and Clocks Determination System (PPOCDS):www.glonass‐svoevp.ru/.