This is probably of general interest after all.
--
/ / _ _ Didier Verna
http://www.inf.enst.fr/~verna/
- / / - / / /_/ / E.N.S.T. INF C201.1 mailto:verna@inf.enst.fr
/_/ / /_/ / /__ / 46 rue Barrault Tel. (33) 01 45 81 73 46
75634 Paris cedex 13 Fax. (33) 01 45 81 31 19