Multifractal analysis of electron images of fossil coal surface Vasiliy Malinnikov, Valeriy Zakharov, Denis Uchaev, Dmitry Uchaev and Olga Malinnikova E3S Web Conf., 56 (2018) 01020 Published online: 26 September 2018 DOI: 10.1051/e3sconf/20185601020