Armstrong; Rossiter
Chem. News J. Ind. Sci., 1892 , vol. 65, p. 58
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Meldola; Desch
Journal of the Chemical Society, 1892 , vol. 61, p. 769
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Meldola
Journal of the Chemical Society, 1885 , vol. 47, p. 523
Journal of the Chemical Society, 1895 , vol. 67, p. 912

Meldola; Streatfeild
Journal of the Chemical Society, 1895 , vol. 67, p. 907