1. V. G. Andreyanov, "Cyclic Oscillations of Annual Runoff, Their Spatial Changes and Consideration in Calculations," in Proceedings of 3rd All-Union Hydrological Congress, Vol. 2 (Gidrometeoizdat, Leningrad, 1959) [in Russian].
2. V. I. Babkin, "The Volga River Runoff in the Periods of Cyclonic Activity Weakening and Strengthening," Meteorol. Gidrol., No. 1 (1995) [Russ. Meteorol. Hydrol., No. 1 (1995)].
3. M. V. Bolgov, E. A. Korobkina, and I. A. Filippova, "Bayesian Prediction of Minimum River Runoff under Nonstationary Conditions of Future Climate Change," Meteorol. Gidrol., No. 7 (2016) [Russ. Meteorol. Hydrol., No. 7, 41 (2016)].
4. M. V. Bolgov, I. A. Filippova, N. V. Osipova, E. A. Korobkina, and M. D. Trubetskova, "Present Features of the Hydrological Regime of the Volga Basin Rivers," Voprosy Geografii, No. 145 (2018).
5. Water Resources of Russia and Their Use, Ed. by I. A. Shiklomanov (State Hydrological Inst., St. Petersburg, 2008) [in Russian].