Repeated Root Constacyclic Codes of Length $mp^s$ over   $\mathbb{F}_{p^r}+u \mathbb{F}_{p^r}+...+ u^{e-1}\mathbb{F}_{p^r}$
  We give the structure of $\lambda$-constacyclic codes of length $p^sm$ over $R=\mathbb{F}_{p^r}+u \mathbb{F}_{p^r}+...+ u^{e-1}\mathbb{F}_{p^r}$ with $\lambda \in \F_{p^r}^*$. We also give the structure of $\lambda$-constacyclic codes of length $p^sm$ with $\lambda=\alpha_1+u\alpha_2+...+u^{e-1} \alpha_{e-1}$, where $\alpha_1,\alpha_2 \neq 0$ and study the self-duality of these codes. 
Kenza Guenda and T. Aaron Gulliver
cs.IT math.IT