  Pseudorapidity and azimuthal three-particle correlations are studied based on
a correlated-cluster model of multiparticle production. The model provides a
common framework for correlations in proton-proton and heavy-ion collisions
allowing easy comparison with the measurements. It is shown that azimuthal
cluster correlations are definitely required in order to understand
three-particle correlations in the near-side ridge effect. This is similar to
the explanation of the ridge phenomenon found in our previous analysis of
two-particle correlations and generalizes the model to higher-order
correlations.
