Analysis of information sources in references of the Wikipedia article "Norgestrel" in English language version.
The 1966 marketing campaign for Schering's second contraceptive, Eugynon, [...] (Schering AG Berline 1966, 11). [...] In 1970 [Schering] had already conducted an opinion poll among doctors in the run up to the marketing campaign for the newly introduced Neogynon. [...]
[The contraceptive Eugynon is launched in 1966. Neogynon follows in 1970.]
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: CS1 maint: archived copy as title (link)[The contraceptive Eugynon is launched in 1966. Neogynon follows in 1970.]
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