Erba S.p.A.
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Erba S.p.A.
Patent: DE1008291 , 1952 ;

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Patent: DE1012301 , 1957 ;

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Pfizer and Co.
Patent: US2837527 , 1952 ;

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Logemann
Farmaco, Edizione Scientifica, 1952 , vol. 7, p. 430,432

Logemann et al.
Farmaco, Edizione Scientifica, 1954 , vol. 9, p. 521,524