Effect of side-wings on draught: The case of Ethiopian ard plough (maresha). - Solomon Gebregziabher; Karel De Swert; Wouter Saeys; Herman Ramon; Bart De Ketelaere; Abdul Mounem Mouazen; Petros Gebray; Kindeya Gebrehiwot; Hans Bauer; Jozef Deckers; Josse De Baerdemaeker (Comput. Electron. Agric., 2016)