Kubota; Perkin
Journal of the Chemical Society, 1925 , vol. 127, p. 1895

Gritsan, N. P.; Klimenko. L. S.; Shvartsberg, E. M.; Khmelinskii, I. V.; Fokin, E. P.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1990 , vol. 39, # 12 p. 2467 - 2470
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1990 , # 12 p. 2721 - 2725

Gritsan, N. P.; Klimenko. L. S.; Shvartsberg, E. M.; Khmelinskii, I. V.; Fokin, E. P.
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), 1990 , vol. 39, # 12 p. 2467 - 2470
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1990 , # 12 p. 2721 - 2725

Perkin; Haddock
Journal of the Chemical Society, 1938 , p. 541,544