Kuhn refers to the book
Ludwik Fleck: Entstehung und Entwicklung einer wissenschaftlichen Tatsache, 1935/reprint
1980 (Frankfurt: Suhrkamp)
In the introduction of his "The Structure of Scientific Revolutions" Kuhn quotes Fleck.
However, a comparison between both works shows how much of Kuhn was already prethought in
Fleck.
Dieter Boegenhold