Question: What contributed to Otto Selz's cessation of work in 1933?

Is 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. a good answer to this question?

Select from: [i] yes. [ii] no.
[ii]