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  1. ^ http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=vacc.chapter.3 ??? ????????? ???? ?? ?????? ????? ? ?????? ????? .
  2. ^ http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1200696 ?? ?????? ???? ?? ?????? ????? ? ?????? ????? .
  3. ^ "Smallpox" . www.who.int (?? ????????) . Retrieved 2022-12-06 .