M. Feliciano and  F. Maia and  A. Gonçalves,  An Analysis of Eco-efficiency and GHG Emission of Olive Oil Production in Northeast of Portugal.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2014, vol. 88(4). 359 - 364
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/9997989.