1. Abd El Aziz, H.M. (1978). The chemical content and nutritive value of some forage plants of north western coast of the UAR. Ph.D. Thesis Fac. Agric. Ain Shams Univ., Egypt.
2. Abd El Aziz, H.M. (1982). A study of the nutritive value of some range plants in the north western coastal desert. PhD Thesis, Fac. Agric. Ain Shams Univ. Egypt.
3. Syria. Int. Conf. on Anim. Prod. in Arid Zones, ICAPAZ, 7-12 Sept. Damascus;AN Abdullah,1987
4. Abou El Nasr, H.M. (1985). A study on the possibility of using desert agricultural by-products in feeding livestock. PhD Thesis Fac. Agric. Cairo Univ. Egypt.
5. Allison, D.W. & Osbourn, D.F. (1970). The cellulose-lignin complex in forages and its relationship to forage nutritive value. J. Agric.Sci. Camb. 74: 23.