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New Delhi, India, 4–9 February 1990
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Kyoto, Japan, 20–25 May 1990
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Montreal, Canada, 8–13 July 1990
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University of Warwick, Coventry, UK, 22–28 July 1990
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Helsinki, Finland, 23–27 July 1990
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Torun, Poland, 30 July–3 August 1990
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Troy, NY, USA, 1–3 August 1990
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Ottawa, Canada, 5–10 August 1990
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Haifa, Israel, 6–10 August 1990
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Yokohama, Japan, 12–17 August 1990
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Gera, GDR, 13–18 August 1990
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Detroit, MI, USA, 19–24 August 1990
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Como, Italy, 26–31 August 1990
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Julich, Federal Republic of Germany, 8–10 October 1990
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Barcelona, Spain, 9–12 October 1990
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Buenos Aires, Argentina, 5–9 November 1990