Accurate hadron spectroscopy on blocked configurations by   tadpole-renormalized, clover-improved Wilson quark action
  We compare the quenched hadron spectrum on blocked and unblocked lattices for the Wilson quark action, the clover action and the tadpole-improved clover action. The latter gives a spectrum markedly closer to the original one, even though the cutoff is 1/a ~ 500 Mev. 
Artan Borici and Philippe de Forcrand