APA-referens (7:e uppl.)

Não informado. USSR and eastern europe scientific abstracts. Joint Publications Research Service.

Chicago-referens (17:e uppl.)

Não informado. USSR and Eastern Europe Scientific Abstracts. Arlington, Wash: Joint Publications Research Service.

MLA-referens (8:e uppl.)

Não informado. USSR and Eastern Europe Scientific Abstracts. Joint Publications Research Service.

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