Original sentence: Instituto de Física Teórica, São Paulo, Brasil; Brookhaven National Laboratory; Lawrence  Berkeley National Laboratory; CERN, Geneva, Switzerland; International Centre for Theoretical Physics, Miramare-Trieste, Italy; Max Planck Institute for Physics, München, Germany.University of Maryland, 1957; Universität Wien, Austria 1961; Imperial College, London1963-64;
Edited sentence: Instituto de Física Teórica, São Paulo, Brasil; Brookhaven National Laboratory; Lawrence Berkeley National Laboratory; CERN, Geneva, Switzerland; International Centre for Theoretical Physics, Miramare-Trieste, Italy; Max Planck Institute for Physics, München, Germany.University of Maryland, College Park, 1957; Universität Wien, Austria 1961; Imperial College, London1963-64;