European Organization for Nuclear Research, International School of Physics "Ettore Majorana" Erice, Italy, & Zichichi, A. (1966). Recent developments in particle symmetries: 1965 international school of physics "Etore Majorana", a CERN-MPI-NATO advanced study institute. Academic Press.

European Organization for Nuclear Research, Italy International School of Physics "Ettore Majorana" Erice, and Antonino Zichichi. Recent Developments in Particle Symmetries: 1965 International School of Physics "Etore Majorana", a CERN-MPI-NATO Advanced Study Institute. New York: Academic Press, 1966.

European Organization for Nuclear Research, et al. Recent Developments in Particle Symmetries: 1965 International School of Physics "Etore Majorana", a CERN-MPI-NATO Advanced Study Institute. Academic Press, 1966.