Clinical and epidemiological features of an outbreak of influenza in Ulan Bator in 1971 von Krylov, V F, Obrosova-Serova, N P, Zilina, N N, Evstigneeva, N A, Molibog, E V, Zakstel'skaja, L J, Kupul, A, Cerencimed, O, Hisigdorz, A

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