Kbaybu, Issa, Mohamad Alzoabi, and Sokrat Ahmad. “The Effect of Biogas Slurry and Mineral Fertilizers on Growth Indicators and Productivity of Maize (Zea Mays L.)”. Tishreen University Journal -Biological Sciences Series 43, no. 4 (September 23, 2021). Accessed January 19, 2022. http://journal.tishreen.edu.sy/index.php/bioscnc/article/view/10935.