Literature cited
A. A. Akhrem. I. S. Levina, L. E. Kulikova, and Yu. A. Titov, Solution to the issuing of Author's Certificate No. 1324172/23-4, dated September 30, 1969.
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Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 2, pp. 497–498, February, 1970.