1. Gidrologiya Del’ty Dunaya (The Danube Delta Hydrology), Mikhailov, V.N., Ed., Moscow: GEOS, 2004.
2. Kharchenko, T.A., Liashenko, A.V., and Bashmakova, I.Kh., Hydrobiol. J., 2000, vol. 36, no. 2, p. 3. https://doi.org/10.1615/HydrobJ.v36.i2.10
3. Timchenko, V.M., Gidrobiologiya Dunaya i Limanov Severo- Zapadnogo Prichernomor’ya (Hydrobiology of the Danube and the Northwest Black Sea Coast Salt Lakes), Kiev: Naukova Dumka, 1986, p. 3.
4. Timchenko, V.M., Ekologichni problemy baseinu Dunayu v mezhakh Ukrainy (Environmental Problems of the Danube Basin within Ukraine), Kiev, 1996, p. 67.
5. Timchenko, V.M., Gidrobiologicheskie issledovaniya Dunaya i pridunaiskikh vodoemov (Hydrobiological Studies of the Danube and the Adjacent Water Bodies), Kiev: Naukova Dumka, 1987, p. 3.