Reference
Abd El-Raheem El-Shanshoury, M. A. Hassan, B. A. Abdel-Ghaffar (1989): Synergistic Effect of Vesicular-Arbuscular-Mycorrhizas and Azotobacter chroococcum on the Growth and the Nutrient Contents of Tomato Plants. – Phyton, Annales Rei Botanicae, Horn – 29_2: 203 - 212.