?url_ver=Z39.88-2004&rft_id=10.1007%2F978-94-009-9825-4_19&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Hansson%2C+B.&rft.aulast=Hansson&rft.aufirst=B.&rft.date=1979&rft.isbn=978-94-009-9825-4&rft.title=Paradoxes+in+a+Semantic+Perspective&rft.btitle=Essays+on+Mathematical+and+Philosophical+Logic&rft.genre=bookitem