1. Yu. F. Smirnov, “Estimation of the storage error of the hydrogen standards time scale taking into account systematic changes in frequency,” Izmer. Tekhn., No. 3, 42–45 (2007).
2. G. Panfilo, A. Harmegnies, and L. Tisserand, “A new prediction algorithm for EAL,” Proc. Joint Meeting of the EFTF and IEEE FCS (2011), pp. 850–855, DOI: https://doi.org/10.1109/FCS.2011.5977808.
3. BIPM Annual Report on Time Activities, Sèvres, France (2018), Vol 13.
4. V. Vorontsov, A. Belyaev, N. Demidov, et al., “Development of an active hydrogen standard for a new generation of frequency and time for a base complex of time and frequency,” Proc. 8th Int. Symp. Metrology of Time and Space, St. Petersburg, Sept. 14–16, 2016, VNIIFTRI, Mendeleevo (2016), pp. 55–57.
5. S. I. Donchenko, I. Yu. Blinov, A. S. Goncharov, et al., “Reference complex of time and frequency,” ibid., pp. 100–101.