@conference { PL1998a,
author = {   Langevin, Philippe   },
title  = {   On Generalized Bent Functions   },
booktitle = {   Designs, Sequences and their correlations   },
address = {   BadWindsheim, aout 1998   },
year = {1998},
rang = {A},
url  =  {http://langevin.univ-tln.fr/recherche/conference/gbf.dvi},
}