Multimeson production in pp interactions as a background for eta and   eta' decays
  Multimeson production in pp interactions comprises important background for eta, omega and eta' mesons production experiments and for the studies of their decays planned with WASA detector at COSY. The available information about the reactions is summarized and the need for efforts to describe the processes is stressed. 
A. Kup\'s\'c, P. Moskal, M. Zieli\'nski