References ; (voce: Gödel); ; ; EMKEncyclopaedia of mathematics. An updated and annotated translation of the Soviet mathematical encyclopaedia, managing editor Michiel Hazewinkel, ed. in 6 v., Dordrecht [etc.], Kluwer academic publishers, 1995 + Supplement 1-3, 1997-2001.
; Wikipedia(IT)Wikipedia. L'enciclopedia libera, 2001 [ed. in lingua italiana dell' enciclopedia online Wikipedia]
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