found a copy here, i think.. https://github.com/eunuchs/unix-archive/blob/master/PDP-11/Bug_Fixes/V7_on11-34/unix_on_1134.txt

On Thu, Feb 12, 2015 at 8:47 AM, Noel Chiappa <jnc@mercury.lcs.mit.edu> wrote:
    > From: Dave Horsfall <dave@horsfall.org>

    > Read my paper on it :-)

URL?

        Noel
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