Book chapter (2014) - E.H. Smidt (author) , T Alemayehu (author) , A Al Weshali (author) , K Assaf (author) , A Babaqi (author) , DA Ghafour (author) , R ter Horst (author) , F van Steenbergen (author) , K Woldearegay (author) , O Zayed (author)