NORTON and SALAGEAN, 2000. On the structure of linear and cyclic codes over finite chain rings. Applicable algebra in engineering, communication and computing, 10, pp. 489-506
We generalise structure theorems of Calderbank and Sloane for linear and cyclic codes over Zpa to a finite chain ring. Our results are more detailed and do not use non-trivial results from Commutative Algebra.