1. Abramov, A.I. and Krymova, E.A., Sostoyanie plodorodiya pakhotnykh zemel’ v Nizhegorodskoi oblasty (Fertility of Ploughlands in Nizhny Novgorod Oblast), Fed. Gos. Budzh. Uchr. Tsentr Agrokhimicheskoi sluzhby “Nizhegorodskii,” 2014. https://agrohim-nn.ru/ stati/47-sostoyanei-plodorodiya-pakhotnykh-zemel-v- nizhegorodskoj-oblasti.html
2. Barabanov, A.T., Dolgov, S.V., Koronkevich, N.I., Panov, V.I., and Petel’ko, A.I., Surface runoff and snowmelt infiltration into the soil on plowlands in the forest-steppe and steppe zones of the East European Plain, Eurasian Soil Sci. 2018, no. 1, pp. 66–72.
3. Dzhamalov, R.G., Frolova, N.L., Kireeva, M.B., Rets, E.P., Safronova, T.I., Bugrov, A.A., Telegina, A.A., and Telegina, E.A., Sovremennye resursy podzemnykh i poverkhnostnykh vod evropeiskoi chasti Rossii (Current Resources of Groundwater and Surface Water in the European Russia), Moscow: GEOS, 2015.
4. Dolgov, S.V., Effect of meteorological factors on long-term variations of groundwater discharge into Volga basin rivers, Izv. Akad. Nauk, Ser. Geogr., 1998, no. 1, pp. 102–110.
5. Dolgov, S.V. and Koronkevich, N.I., Hydrological stage structure of a lowland area, Izv. Akad. Nauk, Ser. Geogr., 2010, no. 1, pp. 7–25.