Hans De Backer. (2016) Skew placement of arches for road bridges. ISEC Press:ม.ป.ท.Hans De Backer. 2016. Skew placement of arches for road bridges. ม.ป.ท.:ISEC Press;Hans De Backer. Skew placement of arches for road bridges. ม.ป.ท.:ISEC Press, 2016. Print.