Lara F. Horani,  A Systematic Literature Review on Changing Customer Requirements for Sustainable Design over Time.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2017, vol. 124(4). 956 - 968
    [viewed 12 July 2020]. Available from: https://publications.waset.org/pdf/10007064.