Upper limit on the eta -> pi^0 pi^0 decay
  Upper bound 6*10^{-4} with 90% confidence is reported for the eta -> pi^0 pi^0 decay from the SND experiment at the VEPP-2M collider. 
M.N. Achasov, A.V. Berdyugin, A.V. Bozhenok, D.A. Bukin, S.V. Burdin,   T.V. Dimova, S.I. Dolinskii, V.P. Druzhinin, M.S.Dub...