1. Analysis of periodicity in hydrological sequences
2. Andel, J., Balek, J. and Verner, M. ‘An analysis of historical sequences of the Nile maxima and minima’. paper presented to the ECA/WMO Conference on the Role of Hydrology and Hydrometeorology in the Economic Development of Africa. Geneva: Addis Ababa, WMO No 301, World Meteorological Organization.
3. Balek, J. 1988. “‘Le regime hydrologique du Bulhilet’”. Constantine, Algeria interim report to Hydroproject Est,