1. Fertilizer value of biogas manure. II. Micronutrients for maize;Abdel-Aziz,1982
2. Biogas manure as a complete fertilizer, feasibility of Egyptian farmers;Alaa El-Din,1984
3. Introduction to soil Microbiology;Alexander,1977
4. Soil dehydrogenase activity;Casida;Soil Sci.,1964
5. Structural Soil and its dehydrogenase activity;Cerna;Acta Univ. Carol. Biologica,1969