Fractal microgeometry of original and hydgrogen-charged graphene multilayer films surface: research by the low-temperature sorption of nitrogen methodSvetlana Vasilyeva, Anna Zheltova, Alexey Merkushkin and Alexander SmolyanskiyMATEC Web Conf., 132 (2017) 03015DOI: https://doi.org/10.1051/matecconf/201713203015