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[S.l. : s.n.], stampa 1990
Paris : OCDE, 1970
Milano : F. Angeli, c1989
Paris : Organisation de cooperation et de developpement economiques
Bari : Laterza, 1969
Roma : Conferenza dei rettori delle università italiane, [2004]
Luxemburg : Office for Official Publications of the European Communities, 1992
Luxembourg : Office for official publications of the European communities, 1998
Paris : Organisation de Cooperation et de Developpement Economiques, 1976