Sergiewskaja; Safonowa
Zhurnal Obshchei Khimii, 1956 , vol. 26, p. 3479,3483; engl. Ausg. S. 3871, 3874
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Hipsher; Wise
Nation. Advis. Comm. Aeronautics Tech. Note, 1951 , # 2430 p. 8