Die beiden Grundprobleme der Erkenntnistheorie - Karl R. Popper - Google Books

https://books.google.de/books?hl=de&lr=&id=1_1lljVGo-UC&oi=fnd&pg=PR17&dq=grundprobleme+der+erkenntnistheorie&ots=iOHezPVYwE&sig

English summary: In his investigations of the problem of induction and the problem of demarcation - the two fundamental problems of the theory of knowledge - Popper criticizes in great detail apriorism (Kant, Fries and Nelson) and logical positivism…