Shahzad S. J. H., Bouri E., Kayani G. M., Nasir R. M., Krištoufek Ladislav :  Are clean energy stocks efficient? Asymmetric multifractal scaling behaviour , Physica. A : Statistical Mechanics and its Applications vol.550, 124519 [2020] Download Download DOI: 10.1016/j.physa.2020.124519