Hashem, Mahmoud S, Tarek Zin El-Abedin, and Hussein M Al-Ghobari. 2018. “Assessing Effects of Deficit Irrigation Techniques on Water Productivity of Tomato for Subsurface Drip Irrigation System”. International Journal of Agricultural and Biological Engineering 11 (4):156-67. https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/3846.