Brown
Chem. Penicillin, <Princeton 1949>, S. 473, 497, 524

Brown
Chem.Penicillin, <Princeton 1949>, S. 492,507,517
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Merck and Co.Inc.
Patent: US2478047 , 1947 ;

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Butenandt; Jatzkewitz; Schiedrt
Hoppe-Seyler's Zeitschrift fuer Physiologische Chemie, 1948 , vol. 283, p. 209,213

Dudley; Bius; Johnson
Journal of Heterocyclic Chemistry, 1973 , vol. 10, # 6 p. 935 - 941