WASET
    T. Chaiechi and  N. Stoeckl,  Estimating the Costs of Conservation in Multiple Output Agricultural Setting.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2013, vol. 78(6). 1840 - 1847
    [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/13703.