Bose
Journal of the Indian Chemical Society, 1955 , vol. 32, p. 450,453, 454
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Schmid; Karrer
Helvetica Chimica Acta, 1949 , vol. 32, p. 960,965
Schmidt
Archiv der Pharmazie (Weinheim, Germany), 1887 , vol. 225, p. 168,180
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Perkin
Journal of the Chemical Society, 1889 , vol. 55, p. 71
Journal of the Chemical Society, 1890 , vol. 57, p. 1014