Determination of phi1_eff (beta_eff) by B0 -> K+K-K0S, pi+pi-K0S and   K0SK0SK0S decays
  Measurements of the CP violation parameter phi1_eff (beta_eff) by b -> s penguin mediated three-body B decays, B0 -> K+K-K0S, pi+pi-K0S and K0SK0SK0S are reviewed in this report. 
Kenkichi Miyabayashi
hep-ex