Kassa, Abiy, Gabriel Temesgen, Mohammedawel Yesuf, and Amanuel Tesfay. 2015. “Impacts of Zero Grazing Techniques on the Livelihood of Rural Community of Tigrai”. International Journal Of Management And Economics Invention 1 (09):398-413. http://www.rajournals.in/index.php/ijmei/article/view/386.