On the discriminant of twisted tensor products
  We provide formulas for computing the discriminant of noncommutative algebras over central subalgebras in the case of Ore extensions and skew group extensions. The formulas follow from a more general result regarding the discriminants of certain twisted tensor products. We employ our formulas to compute automorphism groups for examples in each case. 
Jason Gaddis, Ellen Kirkman, W. Frank Moore
math.RA