Fittig; Stroem
Justus Liebigs Annalen der Chemie, 1892 , vol. 267, p. 192,200
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Burdick; Adkins
Journal of the American Chemical Society, 1934 , vol. 56, p. 438,440
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Farlow et al.
Journal of the American Chemical Society, 1934 , vol. 56, p. 2498