On the conditions to extend Ricci flow(III)
  We simplify and improve the curvature estimates in the paper: On the conditions to extend Ricci flow(II). Furthermore, we develop some volume estimates for the Ricci flow with bounded scalar curvature. These estimates can be applied to study the singularities of the Ricci flow and convergence properties of the K\"ahler Ricci flow. 
Xiuxiong Chen, Bing Wang
math.DG