Wallach
Justus Liebigs Annalen der Chemie, 1877 , vol. 184, p. 83
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Justus Liebigs Annalen der Chemie, 1858 , vol. 108, p. 219
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Journal of the University of Bombay, Science: Physical Sciences, Mathematics, Biological Sciences and Medicine, 1937 , vol. 6/, p. 127,129