Legge
Journal of the American Chemical Society, 1947 , vol. 69, p. 2079,2083
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Bell; Buck
Journal of the Chemical Society, 1956 , p. 1890
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), , vol. 33, p. 644 - 646
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, , # 3 p. 694 - 695