R.I. N¡ 273 

 J.F. CLOUET

THEORIE D'O'DOHERTY-ANSTEY ET

APPROXIMATION-DIFFUSION

The whole paper is available as a compressed Postscript file by internet
procedure FTP anonymous on host barbes.polytechnique.fr ( 129.104.4.100)
in the directory pub/RI/1993 under the name

             clouet.273.nov.92.ps