@conference { PL1999b, author = { Langevin, Philippe }, title = { Gauss Sums over Quasi-Frobenius Rings }, booktitle = { }, organization = { FQ5 }, address = { Augsburg, August 2-16 1999, Germany }, year = {1999}, rang = {A}, url = {http://langevin.univ-tln.fr/recherche/conference/gsqf.dvi}, }