1. D. I. Antonova and T. B. Rozhdestvenskaya, Izmeritel. Tekh., No. 9 (1967).
2. L. A. Vsevolzhskii, Izmeritel. Tekh., No. 2 (1968).
3. P. K. Loog, R. I. Likver, V. A. Reében, and O. V. Saks, Izmeritel. Tekh., No. 6 (1965).
4. V. Veksler, L. Groshev, and B. Isaev, Ionization Methods in Radiation Research [in Russian], Moscow-Leningrad, Gostekhizdat (1949).
5. B. Rossi and G. Staub, Ionization Chambers and Counters [Russian translation] Moscow, IIL (1951).