  Assume that $K$ is an algebraically closed field, $R$ a locally
support-finite locally bounded $K$-category, $G$ a torsion-free admissible
group of $K$-linear automorphisms of $R$ and $A=R/G$. We show that the
Krull-Gabriel dimension $KG(R)$ of $R$ is finite if and only if the
Krull-Gabriel dimension $KG(A)$ of $A$ is finite. In these cases $KG(R)=KG(A)$.
We apply this result to determine the Krull-Gabriel dimension of standard
selfinjective algebras of polynomial growth. Finally, we show that there are no
super-decomposable pure-injective modules over standard selfinjective algebras
of domestic type.
