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* Council of Europe (Strasbourg, France, 2012)

* The Lay State and Religious Liberty (Mexico City, 2009)

* Religious Liberty and Relativism (Rome, 2005)

* Secularization: Philosophical Foundations, Historical Backgrounds, and Contemporary Challenges (Oxford, 2003)

* Truth and Freedom: Toward a Common Understanding Among Muslims, Jews and Christians (Washington, 2002)

* Church as Politeia: The Political Self-Understanding of Christianity (Oxford, 2000)

* Religious Liberty and the Ideology of the State (Prague, 2000)

* Pluralism and Religious Liberty (Jerusalem, 1997)

* Secularism and Religious Liberty (Rome, 1995)