$ACL$ and differentiability of open discrete ring $(p,Q)$-mappings

We study the so-called $(p,Q)$-mappings which naturally generalize quasiregular mappings. It is proved that open discrete ring $(p,Q)$-mappings are differentiable almost everywhere as $p>n-1$ and locally integrable $Q.$ Furthermore, we prove that open discrete $(p,Q)$-mappings belong to the class $ACL$ in ${Bbb R}^n$ and $fin W_{rm loc}^{1,1}$ the same conditions on $p$ and $Q.$