Some Constacyclic Codes over Finite Chain Rings
  For $\lambda$ an $n$-th power of a unit in a finite chain ring we prove that $\lambda$-constacyclic repeated-root codes over some finite chain rings are equivalent to cyclic codes. This allows us to simplify the structure of some constacylic codes. We also study the $\alpha +p \beta$-constacyclic codes of length $p^s$ over the Galois ring $GR(p^e,r)$. 
Aicha Batoul, Kenza Guenda and T. Aaron Gulliver
cs.IT math.IT