@INPROCEEDINGS { Langevin4,
author = {  Langevin, Philippe  },
title  = {  On generalized bent functions  },
booktitle = {  Eurocode 92  },
pages = {  147--157  },
series  = {  CISM Courses and Lectures  },
volume  = {  339  },
year = {1992},
rang = {B},
}