State contracts and their governing law : a reappraisal -- The international responsibility of states based on investment promotion and protection treaties -- The state's normative freedom and the question of indirect expropriation -- Some theoretical reflections on state contracts -- Hans Kelsen and the advancement of international law -- The notion of Civitas Maxima in Kelsen's work -- International courts in an interstate society -- The state within the meaning of international law and the state within the meaning of municipal law (on the theory of the dual personality of the state) -- On the legal nature of the European Communities centralisation/decentralisation of a legal order -- A federation of nation states or a federal state? -- Is there a European approach to human rights?