Visoth Sambath Ky และ Thaksin Thepchatri. (2012) Optimal design of steel structures using heuristic algorithm with direct analysis method. Chulalongkorn University:ม.ป.ท.Visoth Sambath Ky และ Thaksin Thepchatri. 2012. Optimal design of steel structures using heuristic algorithm with direct analysis method. ม.ป.ท.:Chulalongkorn University;Visoth Sambath Ky และ Thaksin Thepchatri. Optimal design of steel structures using heuristic algorithm with direct analysis method. ม.ป.ท.:Chulalongkorn University, 2012. Print.