@PHDTHESIS{lafor2000,
url = "
		http://www.theses.fr/2000PA077122",
title = "Symetries et integrabilite des equations aux differences finies",
author = "LAFORTUNE, STEPHANE",
year = "2000",
pages = "138 p.",
note = "Thèse de doctorat dirigée par Gazeau, Jean-Pierre Physique Paris 7 2000",
note = "2000PA077122",
}