Não informado. USSR and eastern europe scientific abstracts. Joint Publications Research Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. USSR and Eastern Europe Scientific Abstracts. Arlington, Wash: Joint Publications Research Service.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. USSR and Eastern Europe Scientific Abstracts. Joint Publications Research Service.
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