1. The influence of Acacia tortilis (Forssk.) subsp. raddiana (Savi) and livestock grazing on grass species composition, yield and soil nutrients in arid environments of South Tunisia;Abdallah;Flora,2008
2. AFNOR, 1987. Recueil de normes francaises, qualite des sols, methodes d’analyses. 1. edit. Association francaise de normalisation (Afnor), pp. 19–30.
3. Aidoud, A., 1989. Contribution à l’étude des écosystèmes steppique pâturés des hautes plaines Algéro-Oranaises (Algérie). Ph.D. Thesis, Université des sciences et technologies, H. Boumediene, Alegria, 248 pp.
4. Ecology, Individuals, Populations and Communities;Begon,1990
5. Effects of grazing, competition, disturbance and fire on species composition and diversity in grassland communities;Belsky;J. Veg. Sci.,1992