The structure of finite local principal ideal rings
  A ring $R$ is called a PIR, if each ideal of $R$ is a principal ideal. An local ring $(R,\mf{m)}$ is a artinian PIR if and only if its maximal ideal $\mf{m}$ is principal and has finite nilpotency index. In this paper, we determine the structure of a finite local PIR. 
Tongsuo Wu, Houyi Yu and Dancheng Lu
math.AC math.RA