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Olga Orynycz and  Andrzej Wasiak ,  The Effects of Plantation Size and Internal Transport on Energy Efficiency of Biofuel Production.   journal   = {International Journal of Electrical, Computer, Energetic, Electronic and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology. September 2017, vol. 129(9). 979 - 984[viewed 25 May 2018]. Available from: http://waset.org/publications/10007809.