PRINCIPAL DIRECTIONS OF THE FURTHER UPDATE OF THE GLONASS TIME-AND-FREQUENCY SUPPORT - PDF (Russian)
Copyright (c) 2013 Bogdanov P.P., Druzhin V.E., Nechaeva O.E., Tyulyakov A.E., Feoktistov A.Y., Shupen K.G.
![Creative Commons License](http://licensebuttons.net/l/by/4.0/88x31.png)
This work is licensed under a Creative Commons Attribution 4.0 International License.