Salmi; Pohjolainen
Chemische Berichte, 1939 , vol. 72, p. 798,801
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Lucas; Prater
Journal of the American Chemical Society, 1937 , vol. 59, p. 1684
Bergel'son,L.D. et al.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1962 , p. 1525 - 1529
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1962 , # 9 p. 1612 - 1617