"Project 2001" - legal framework for the commercial use of outer space: recommendations and conclusions to develop the present state of the law ; proceedings of an international colloquium Cologne, May 29 - 31, 2001 to present conclusions of "Project 2001" - a joint international research project - Böckstiegel, Karl-Heinz (Schriften zum Luft- und Weltraumrecht, 2002)
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