A study of the eta eta channel produced in central pp interactions at   450 GeV/c
  The reaction pp -> pf (eta eta) ps has been studied at 450 GeV/c. For the first time a partial wave analysis of the centrally produced eta eta system has been performed. Signals for the f0(1500), f0(1710) and f2(2150) are observed and the decay branching fractions of these states are determined. 
The WA102 Collaboration, D. Barberis, et al