A Model of Value-based Democracy as Condition of Ecological Sustainability, in: Democracy, Ecological Integrity and International Law, ed. J. Ronald Engel, Laura Westra and Klaus Bosselmann, 2010, ISBN 13: 989-1-4438-1767-7; ISBN 1-4438-1767-8. [PDF]
Democracy an Unattainable Promise? The four-way-path-model of a future democracy (Lecture at the American University of Sophia, and at the Free University of Varna, Bulgaria, Oct. 2004) [PDF]
The four-way-path of democracy [PDF]
Language Theory for the Computer: Monodimensional Semantics or Multidimensional Semiotics?, in: Knowledge Organization 23 (1996), p. 147–156. [Monodimensional Semantics or Multidimensional Semiotics?] [PDF]
New Body-Mind-Spirit-Anthropology and Ancient Doctrine of Chakras as Common Fundament of Eco-Logic, Contribution to the Congress for the Inter-Religious Federation for World Peace, New Delhi, February 1–7, 1993. [PDF]
«Project World Ethic». Critical Remarks on Kueng's Book from the Viewpoint of Religious Philosophy (Contribution to the Conference «God: the Contemporary Discussion», Paris, Mai 1992 (Conference Paper).
Theory of practical communication: a Christian approach, in: Media Development. Journal of the World Association for Christian Communication, Vol. XXVIII/4 (1981) 1–9.
Theory of Practical Communication: a Philosophical and Christian Approach, in: Communications 12 (1986) 7–25.
The Problem of Institutionalized Religion at the Dawn of the Aquarian Age, in: Acts of the Assembly of the World's Religions, San Francisco 1990 (Conference-Paper).
Ancilla Theologiae? Can philosophy help to articulate common divine contents of spiritual experiences. New Era Conference in Assisi: «God: a Contemporary Discussion» (Conference Paper).
What can we expect from Philosophy of Religion for the Future of Europe? (Contribution to the Conference «Europe in Search of its Identity», Gent, Sept. 1989; Conference Paper).