1.

図書
図書
1. The theory of orbits in the solar system and in stellar systems, organized in cooperation with Cospar, held in Thessaloniki, Greece, 17-22 August 1964
edited by George Contopoulos
出版情報: London : Academic Press, 1966
シリーズ名: Symposium / International Astronomical Union ; no. 25
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2.

図書
図書
2. The spiral structure of our galaxy
edited by W. Becker and G. Contopoulos
出版情報: Dordrecht : D. Reidel, 1970
シリーズ名: Symposium / International Astronomical Union ; no. 38
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