Muhamad Sani Buang and  Shahrul Azam Abdullah and Juri Saedon,  Optimization of Springback Prediction in U-Channel Process Using Response Surface Methodology .   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2015, vol. 103(7). 1216 - 1223
    [viewed 19 November 2019]. Available from: https://publications.waset.org/pdf/10001748.