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Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1976 , vol. 25, p. 2228 - 2229
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1976 , vol. 25, p. 2385 - 2386
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Am.Cyanamid Co.
Patent: US2821521 , 1954 ;