Carlos Ferreira and  Paulo Freitas and  Valentim Freitas,  The Design Process of an Interactive Seat for Improving Workplace Productivity.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2017, vol. 131(11). 1799 - 1803
    [viewed 21 January 2022]. Available from: https://publications.waset.org/pdf/10008194.