Birth and Evolution of Massive Stars and Stellar Groups Proceedings of a Symposium held in Dwingeloo, The Netherlands, 24–26 September 1984

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Double Stars, Physical Properties and Generic Relations Proceeding of IAU Colloquium No. 80 held at Lembang, Java 3—7 June 1983

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Fundamental Stellar Properties: the Interaction Between Observation and Theory

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Binary and Multiple Stars as Tracers of Stellar Evolution Proceedings of the 69th Colloquium of the International Astronomical Union, Held in Bamberg, F.R.G., August 31 – September 3, 1981

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Pulsation, Rotation and Mass Loss in Early-Type Stars (International Astronomical Union Symposia)

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Wide Components in Double and Multiple Stars Proceedings of the 97th Colloquium of the International Astronomical Union held in Brussels, Belgium, 8–13 June, 1987

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Formation and Evolution of Low Mass Stars (Nato Science Series C:, 241)

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Dynamics of Comets: Their Origin and Evolution Proceedings of the 83rd Colloquium of the International Astronomical Union, Held in Rome, Italy, 11–15 June 1984