Evaluation of the effectiveness of leveraging capital of a telecommunication company Tatyana Martynova, Oleslav Antamoshkin, Yuriy Danilchenko, Dmitry Eremeev and Elena Vaitekunene SHS Web Conf., 116 (2021) 00082 Published online: 30 July 2021 DOI: 10.1051/shsconf/202111600082