@INPROCEEDINGS { Langevin3,
author = {  Langevin, Philippe  },
title  = {  On the orphans and covering radius of the Reed-Muller codes  },
booktitle = {  AAECC 9  },
journal = {  Lectures Notes in Computer Sciences  },
pages = {  234--240  },
volume  = {  539  },
year = {1991},
}