00566naa#a2200193#i#450# EN\\bibl\87990 20250627135850.5 2074-8183 20160925b2016####ek#y0engy0150####ca RUS RU POLICE OFFICERS’ ACTIVITY ON PROVIDING PUBLIC ORDER AND SECURITY DURING MASS EVENTS Journal article Volgograd Volgograd Academy of the Ministry of Internal Affairs of Russia 2016 5 с. Journal article local va-mvd.editorum.ru