C. Vrekos and  C. Evagelides and  N. Samarinas and  G. Arampatzis ,  Critical Terrain Slope Calculation for Locating Small Hydropower Plants.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2018, vol. 134(2). 96 - 100
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/10008575.