00553naa#a2200181#i#450# EN\INFRA-M\bibl\4105 20240509083404.4 1998-071X 20141223b2014####ek#y0engy0150####ca RUS RU Analysis of Particle Motion in Wall-Free Concentrated Vortexes in Relation to Flight Safety Problem Journal article Moscow INFRA-M Academic Publishing LLC. 2014 5 с. Journal article local Varaksin A. Yu. Protasov M. naukaru.ru