Losanitsch
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Wolff
Chemische Berichte, 1893 , vol. 26, p. 2217

Shevelev,S.A. et al.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1976 , vol. 25, # 12 p. 2535 - 2548
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1976 , vol. 25, # 12 p. 2725 - 2738

Villiers
Bulletin de la Societe Chimique de France, 1884 , vol. <2>41, p. 284
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