I want to know the answer to the following question:
What contributed to Otto Selz's cessation of work in 1933?
All the background I'm provided with is that "Hark (Groningen, The Netherlands) published a book, called Popper, Otto Selz and the rise of evolutionary epistemology, in which he claimed that Popper took some of his ideas from his tutor, the German psychologist Otto Selz.". Is that enough to answer the question?