`Comparing the Predicted Abell/ACO Cluster & the MarkIII Galaxy Density   and Velocity Fields', Contribution to the Wide Field Spectroscopy Meeting   held in Athens, 20-24 May 1996
  We compare the predicted Abell/ACO cluster density and velocity fields, using linear theory, with that based on the MarkIII catalog and the POTENT machinery within 7000 km/sec. Both density & velocity fields are in good qualitative agreement indicating that apart from a linear biasing factor the optical Abell/ACO clusters do trace the underlying mass distribution quite well. 
M. Plionis, E. Branchini, I. Zehavi and A. Dekel