Advances of Science and Technology: 7th EAI International Conference, ICAST 2019, Bahir Dar, Ethiopia, August 2–4, 2019, Proceedings - Habtu; Admasu, Bimrew Tamrat; Ayele, Delele Worku; Bitew, Mekuanint Agegnehu; Fanta, Solomon Workneh (Springer International Publishing, 2020)