@conference { PLci08,
author = {   Philippe Langevin   },
title  = {   Gauss sums over finite rings   },
booktitle = {   Ecole internationale : Codes over finite rings  },
month  = {   Aout   },
organization = {   CIMPA-METU  },
address = {   Ankara, Turquie   },
year = {2008},
rang = {I},
}