1. Abdel Monem, M., A. Azzaoui, M. El Gharous, J. Ryan, and P. Soltanpour. 1990a. Residual nitrogen and phosphorus for dryland wheat in central Morocco, pp. 163–175. In: Ryan, J., Matar, A. (eds.) Proc. Third Regional Soil Test Calibration Workshop. ICARDA, Aleppo, Syria.
2. Abdel Monem, M., J. Ryan, and M. El. Gharous, 1990b. Preliminary assessment of the soil fertility status of the mapped area of Chaouia. Al Awamia 72: 85–107.
3. Abdel Monem, M., A. Azzaoui, M.E. Gharous, J. Ryan, and P. Soltanpour. 1990c. Fertilizer placement for dryland wheat in Central Morocco, pp. 149–162. In: Ryan, J., Matar, A. (eds.) Proc. Third Regional Soil Test Calibration Workshop. ICARDA, Aleppo, Syria.
4. Abedi, M.J., and O. Talibudeen. 1974. The calcareous soils of Azerbaijan. I. Catena development related to the distribution and properties of soil carbonate. J. Soil Sci. 25: 357–372.
5. Abreu, M.M., and M. Robert. 1985. Characterization of maghemite in B horizons of three soils from southern Portugal. Geoderma 36: 97–108.