Essential norms of Volterra-type operators between~$Zygmund$~ type   spaces
  ~In this paper, we investigate the boundedness of some Volterra-type operators between ~$Zygmund$~ type spaces. Then, we give the essential norms of such operators in terms of ~$g,\varphi$, their derivatives and the n-th power ~$\varphi^n$ of ~$\varphi$. 
Shanli Ye, Caishu Lin
math.CV