Mkrtchyan, K.A., Yamnenko, T.M., Holovan, T.G. y Zhdan, M.D. 2020. Improvement of organizational measures to ensure public security and order during the mass events by the National Police of Ukraine. Revista Amazonia Investiga. 9, 26 (feb. 2020), 167–173. DOI:https://doi.org/10.34069/AI/2020.26.02.18.