Bound of automorphisms of projective varieties of general type
  We prove that there exists a positive number $C_{n}$ depending only on $n$ such that for every smooth projective $n$-fold of general type $X$ defined over {\bf C}, the automorphism group $Aut(X)$ satisfies the inequality $\sharp{Aut}(X)\leq C_{n}\cdot\mu (X,K_{X})$, where $\mu (X,K_{X})$ is the volume of $X$ with respect to $K_{X}$. 
Hajime Tsuji