1. A. Claude, M. Desaintfuscien, P. Petit, and J.-P. Schermann, “Design of a double focalization in a hydrogen maser,” IEEE Trans. Instr. Mass., IM-17 (1968).
2. E. M. Mattison, R. F. C. Vessot, and W. Shen, “Single-state selection system for hydrogen masers,” IEEE Trans. Ultrason., Ferroelectr., and Freq. Contr., 34, Iss. 6, 622–628 (1987).
3. A. Boyko, G. Yolkin, N. Gestkova, G. Kurnikov, and V. Paramzin, “Hydrogen masers with improved short-term frequency stability,” in: Proc. 15th Europ. Frequency and Time Forum, Swiss Foundation for Research in Microtechnology, Neuchatel, Switzerland (2001), pp. 406–408.
4. V. A. Polyakov, A. A. Belyayev, N. A. Demidov, and Yu. V. Timofeyev, “Mathematical simulation of a system of sorting of a beam of hydrogen atoms to increase the short-term stability of the frequency of a hydrogen generator,” in: Metrology of Time and Space: Proc. 6th Inter. Symposium, VNIIFTRI, Mendeleevo (2013), pp. 354–355.
5. M. S. Aleynikov and A. I. Boyko, “On the single-state selection for H-maser and its signal application for fountain atomic standard,” in: Proc. 28th Europ. Frequency and Time Forum, Swiss Foundation for Research in Microtechnology, Neuchatel, Switzerland (2014), pp. 169–172.