On Sun, 25 Nov 2001, David Simmons wrote:

> > cf the Castagna's nice paper
> > http://citeseer.nj.nec.com/castagna95covariance.html
> 
> Sorry, I could not access the paper on that site without an ACM online
> library membership. Feel free to send me a PDF if available.
> 
I get a link up in the right corner to a cached PDF. The link is long so
may not come out right but anyway:

http://citeseer.nj.nec.com/cache/papers/cs/1026/http:zSzzSzwww.dmi.ens.frzSzftpzSzpubzSzdmizSzuserszSzlienszSzliens-94-18.A4.pdf/castagna94covariance.pdf

Regards,

/Robert