Group theoretical methods in physics proceedings of the XVIII international colloquium held at Moscow, USSR, 4-9 June 1990
V. V Dodonov; V. I Man§ko (Vladimir Ivanovich); International Colloquium on Group Theoretical Methods in Physics (18th 1990 Moscow, Russia)
Berlin ; New York Springer-Verlag c1991
Available at IF - Instituto de Física (MS LNP v.382 )(GetIt)