Salagean, Ana On the isometries between Z(pk) and Zpk We prove that, except for the well-known case p=k=2, it is not possible to construct a weight function on Z(pk) for which Z(pk) is isometric to Zpk with the Hamming metric Hamming metric;Isometries;Gray map;Artificial Intelligence and Image Processing;Information and Computing Sciences not elsewhere classified 2006-08-22
    https://repository.lboro.ac.uk/articles/journal_contribution/On_the_isometries_between_Z_pk_and_Zpk/9402497