Shchetinin E.Y. (Щетинин Е.Ю.). Study of the impact of the COVID-19 pandemic on international air transportation = Исследование влияния пандемии COVID-19 на международные авиаперевозки // Discrete and Continuous Models and Applied Computational Science. – 2021. – № 1.-С.22-35. — Только в электронном виде. — <URL:http://elib.fa.ru/art2021/bv3178.pdf>.
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