Karl Raimund Popper/ Alan Ryan (INT)/ E. H. Gombrich (CON)
(1)
Karl Raimund Popper/ David Miller
(1)
Karl Raimund Popper/ John C. Eccles
(1)
Karl Raimund Popper/ Mark Amadeus Notturno (EDT)
(1)
Karl Raimund Popper/ Patrick Camiller (TRN)
(1)
Karl Raimund Popper/ William Warren Bartley
(1)