Nasiri Ahmadullah and  Shimozato Tetsuhiro and  Masayuki Tai,  A Study on Application of Elastic Theory for Computing Flexural Stresses in Preflex Beam.   journal   = {International Journal of Structural and Construction Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2017, vol. 130(10). 1364 - 1367
    [viewed 21 January 2021]. Available from: https://publications.waset.org/pdf/10007995.