Gmelin; Virtanen
Acta Chemica Scandinavica (1947-1973), 1959 , vol. 13, p. 1718

Kjaer et al.
Acta Chemica Scandinavica (1947-1973), 1956 , vol. 10, p. 432,437
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Schultz; Wagner
Archiv der Pharmazie (Weinheim, Germany), 1956 , vol. 289, p. 597,603
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Hopkins
Canadian Journal of Research, Section B: Chemical Sciences, 1938 , vol. 16, p. 341,342