Salah R. Al Zaidee and  Ali S. Mahdi,  Meta Model for Optimum Design Objective Function of Steel Frames Subjected to Seismic Loads.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2016, vol. 120(12). 1580 - 1589
    [viewed 23 September 2020]. Available from: https://publications.waset.org/pdf/10005960.