Energy intensitites, EROI (energy returned on invested), for electric energy sourcesD. Weissbach, F. Herrmann, G. Ruprecht, A. Huke, K. Czerski, S. Gottlieb and A. HusseinEPJ Web Conf., 189 (2018) 00016DOI: https://doi.org/10.1051/epjconf/201818900016