Azimuthal Structures of Produced Particles in Heavy Ion Interactions
  The angular substructures of particles produced in 208Pb at 158 A GeV/c and 197Au at 11.6 A GeV/c induced interactions with Ag(Br) nuclei in emulsion detector have been investigated. Nonstatistical ring-like substructures of produced particles in azimuthal plane of a collision have been found and their parameters have been determined. 
S. Vokal, A. Kravcakova, S. Lehocka, G.I. Orlova