1. Paylore, P., and J.R. Greenwell, Arid Lands Newsletter 10:17 (1979).
2. Rogers, J.H., Ibid. 14:24 (1981).
3. Meigs, P., in Review of Research on Arid Zone Hydrology, UNESCO, Paris, Arid Zone Programme 1:203 (1953).
4. McGinnies, W.S., in Arid-Land Ecosystems: Their Structure, Functioning, and Management, edited by D.W. Goodall and R.A. Perry, Vol. 1, I.P.B. No. 16, Cambridge, Cambridge University Press, 1979, pp. 229–316.
5. Troll, C., in World Maps of Climatology, edited by E. Rodenwalt and H. Jusatz, Springer Verlatz, Berlin, 1965, pp. 40–53.