@conference { bfa14,
author = {   Langevin, Philippe   },
title  = {   New Open Problems Related to Old Conjectures by Helleseth   },
month  = {   September   },
note   = {   invited speaker   },
organization = {   Boolean Functions and Applications   },
address = {   Rosendal, Norway   },
year = {2014},
rang = {A},
url  =  { http://langevin.univ-tln.fr/recherche/drafts/openpb.pdf},
}