Kupchan et al.
Journal of the American Chemical Society, 1953 , vol. 75, p. 5519,5524
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Stoll; Seebeck
Helvetica Chimica Acta, 1953 , vol. 36, p. 189,196
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Pelletier; Jacobs
Journal of the American Chemical Society, 1953 , vol. 75, p. 3248,3251