$G$-algebras, group graded algebras, and Clifford extensions of blocks
  Let $K$ be a normal subgroup of the finite group $H$. To a block of a $K$-interior $H$-algebra we associate a group extension, and we prove that this extension is isomorphic to an extension associated to a block given by the Brauer homomorphism.   This may be regarded as a generalization and an alternative treatment of Dade's results "Block extensions" Section 12. 
Tiberiu Coconet
math.RT