Prokhorov,A M. (1977). Great Soviet encyclopedia,Vol.15 (3rd ed.). Macmillan.
Chicago Edition CitationProkhorov,A M. Great Soviet Encyclopedia,Vol.15. 3rd ed. Newyork: Macmillan, 1977.
Deismireacht MLAProkhorov,A M. Great Soviet Encyclopedia,Vol.15. 3rd ed. Macmillan, 1977.
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