Ie-jung Choi,  Estimating Cost of R&D Activities for Feasibility Study of Public R&D Investment.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2012, vol. 71(11). 2824 - 2827
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/6620.