J. Julve and M. Ramon-Medrano.International G. I. F. T. Seminar(12th : 1981 : Sant Feliu de Guixols, Spain):Non-perturbative aspects of quantum field theory; proceedings, 1-5 June 1981.WS,1982.
International G. I. F. T. Seminar(12th : 1981 : Sant Feliu de Guixols, Spain):Non-perturbative aspects of quantum field theory; proceedings, 1-5 June 1981