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Helvetica Chimica Acta, 1934 , vol. 17, p. 1407,1412
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Butenandt; Schmidt-Thome
Chemische Berichte, 1936 , vol. 69, p. 882,887
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Windaus
Chemische Berichte, 1906 , vol. 39, p. 518,521
Archiv der Pharmazie (Weinheim, Germany), 1906 , vol. 246, p. 117,131