@incollection{eprints2161,
          editor = {Gregory Claeys},
           pages = {641--642},
         address = {Washington},
       publisher = {CQ Press},
       booktitle = {Encyclopedia of Modern Political Thought},
           title = {Popper, Karl},
          volume = {2},
            year = {2013},
          author = {Stefano Gattei},
             url = {http://eprints.imtlucca.it/2161/}
}