Increase of energy efficiency of mine fans work on a mine vent networkTetiana Bunko, Maksym Shyshov, Oleksandr Bokii, Anatolii Belikov, Oleksandr Zhalilov and Ivan KokoulinE3S Web Conf., 109 (2019) 00012DOI: https://doi.org/10.1051/e3sconf/201910900012