@INPROCEEDINGS { Langevin2,
author = {  Langevin, Philippe  },
title  = {  The covering radius of $R(1,9)$ in $R(3,9)$  },
booktitle = {  Eurocode 90  },
pages = {  51--61  },
publisher = {  Springer-Verlag  },
series  = {  Lectures Notes in Computer Sciences  },
volume  = {  514  },
year = {1990},
rang = {B},
}