WASET
    Franklin Nantui Mabe and  Samuel A. Donkoh and  Seidu Al-Hassan,  Accounting for Rice Productivity Heterogeneity in Ghana: The Two-Step Stochastic Metafrontier Approach.   journal   = {International Journal of Agricultural and Biosystems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2018, vol. 140(8). 223 - 232
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/10009379.