B. W. Furt.International Colloquium on Group Theoretical Methods in Physics(9th : 1980 : Cocoyoc, Mexico)：Group theoretical methods in physics, proceedings of the International colloquium.Springer,1980.
International Colloquium on Group Theoretical Methods in Physics(9th : 1980 : Cocoyoc, Mexico)：Group theoretical methods in physics, proceedings of the International colloquium
