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2. Agassi [1969]: ‘Popper on Learning from Experience’ in Rescher (ed.): Studies in the Philosophy of Science, American Philosophical Quarterly Monograph Series,S. 162–171.
3. Black [ 1967 ]: ‘Induction’ in P. Edwards (ed.): The Encyclopedia of Philosophy, 4, S. 169.
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5. Feyerabend [ 1969 ]: ‘A Note on Two ‘Problems’ of Induction’, British Journal for the Philosophy of Science, 19, S. 251–3.