Observation of π+π−π+π− photoproduction in ultraperipheral heavy-ion collisions at sNN=200 GeV at the STAR detector
B. I. Abelev, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants et autres
us, in, ru, gb, nl, cz, cn, kr, br, fr (code pays fourni par la source)