1. Bardossy, A. (1994) Statistical persistence in hydroclimatological time series. Working Paper, University of Stuttgart, Germany, 219?233.
2. Evidence of climate change based on rainfall records in Nigeria
3. Bouza�ane, S. & Lafforgue, A. (1986) Monographie hydrologique des oueds Z�roud et Merguellil. DGRE-ORSTOM, Tunis, Tunisie.