Baeyer
Chemische Berichte, 1876 , vol. 9, p. 1232
Justus Liebigs Annalen der Chemie, 1880 , vol. 202, p. 74,75
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Baeyer
Justus Liebigs Annalen der Chemie, 1880 , vol. 202, p. 56,63
Lund
Acta Chemica Scandinavica (1947-1973), 1958 , vol. 12, p. 136
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Hubacher
Journal of the American Chemical Society, 1943 , vol. 65, p. 2097