1. G. P. Kalinin, Problems of Global Hydrology (Gidrometeoizdat, Leningrad, 1968) [in Russian].
2. M. I. L’vovich, World Water Resources and Their Future (Mysl’, Moscow, 1974) [in Russian].
3. M. Falkenmark and G. Lindth, “How can we cope with the water resources situation by the year 2015?,” Ambio, No. 3, 114−121 (1974).
4. I. A. Shiklomanov, Study of Land Water Resources: Results, Problems, Prospects (Gidrometeoizdat, Leningrad, 1988) [in Russian].
5. V. P. Andressian, Forecasting Water Requirements for the Beginning of the 21st Century: A World-Scale Study (UNESCO, Paris, 1994).