Dust emissions’ reduction into the atmosphere by environmental-engineering systems of smallsize devices with counter-swirling flows (CSF)N.M. Sergina, A.A. Sakharova, V.N. Azarov, D.V. Azarov and M.A. NikolenkoE3S Web Conf., 138 (2019) 01037DOI: https://doi.org/10.1051/e3sconf/201913801037