Prokhorov,A M. (1975). Great Soviet encyclopedia,Vol.7 (3rd ed.). Macmillan.
Chicago Edition CitationProkhorov,A M. Great Soviet Encyclopedia,Vol.7. 3rd ed. Newyork: Macmillan, 1975.
Deismireacht MLAProkhorov,A M. Great Soviet Encyclopedia,Vol.7. 3rd ed. Macmillan, 1975.
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