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Yiannis Sakellaridis
W. G. McKay
Cees W. Passchier
Toshiyuki Kobayashi
Siegfried Siegesmund
Sreepat Jain
Rafael Angulo-Jaramillo
Gautam Sen
Nikita V. Chukanov
B. Hofmann-Wellenhof
Jose M. Azcue
Henk Kars
Alessandro Figà-Talamanca
V. Bargmann
Claudia Kuenzer
International Colloquium on Group Theoretical Methods in Physics Cocoyoc, Mexico 1980.
International Colloquium on Group Theoretical Methods in Physics Université de Montréal 1976.
Knut Bjørlykke
P. Parnell