1. Alley, W. M.: 1984, ?The Palmer Drought Severity Index: Limitations and Assumptions?,J. Clim. Appl. Meteorol. 23, 1100?1109.
2. Alley, W. M.: 1985, ?The Palmer Drought Severity Index as a Measure of Hydrological Drought?,Water Resourc. Bull. 21, 105?114.
3. Askew, A. J.: 1987, ?Climate Change and Water Resources?, in Solomon, S. I., Beran, M., and Hogg, W. (eds.),The Influence of Climate Change and Climate Variability on the Hydrologic Regime and Water Resources, Publication No. 168, International Association of Scientific Hydrology, pp. 321?430.
4. Beran, M.: 1986 ?The Water Resource Impact of Future Climate Change and Variability?, in Titus, J. G. (ed.),Effects of Changes in Stratospheric Ozone and Global Climate, UNEP/EPA, Washington, D.C.
5. Bhowmilk, N. G., Adams, J. R., Bonini, A. P., Klock, A. M., and Demissie, M.: 1986,Sediment Loads of Illinois Streams and Rivers, Report of Investigation 106, Illinois State Water Survey, 167 pp.