1. Baldina, E.A. and Troshko, K.A., Mapping the current state and long-term changes in agricultural land use in the Volga delta, Geod. Kartogr., 2016, no. 11, pp. 39–46. https://doi.org/10.22389/0016-7126-2016-917-11-39-46
2. Bartalev, S.A., Egorov, V.A., Zharko, V.O., Lupyan, E.A., Plotnikov, D.E., Khvostikov, S.A., and Shabanov, N.V., Sputnikovoe kartografirovanie rastitel’nogo pokrova Rossii (Satellite Mapping of Vegetation Cover of Russia), Moscow: IKI RAN, 2016.
3. Brylev, V.A. and Ovcharova, A.Yu., Ecological and economic optimization of flooding of the Volga–Akhtuba floodplain, Izv. Vyssh. Uchebn. Zaved., Sev.-Kavk. Reg., Estestv. Nauki, 2013, no. 5, pp. 67–70. https://ozvap.nextgis.com/.
4. Chen, J., Ban, Y., and Li, S., China: Open access to Earth land-cover map, Nature, 2014, vol. 514, no. 7523, p. 434. https://doi.org/10.1038/514434c
5. Ekologicheskii entsiklopedicheskii slovar’ (Ecological Encyclopedic Dictionary), Dediu, I.I., Ed., Kishinev: Glavnaya redaktsiya Moldavskoi sovetskoi entsiklopedii, 1989. https://ozvap.nextgis.com/.