I see that Maziels and Coile have already offered
to scan (or copy) the Bach & Buroff paper. I have
it too, just haven't scanned it.
The original requester should also try to find
the even earlier work on Unix multiprocessing:
Hawley, J. A., Meyer, W. D. (1975) MUNIX: A Multiprocessing Version of UNIX,
MoS. Thesis, Naval Postgraduate School - Monterey. June.
Goble, G.H. and M.H.Marsh, "A Dual Processor VAX 11/780",
Purdue University Technical Report, TR-EE 81-31, Sept. 1981.
This used to be at
but for some reason Goble's pages have been
withdrawn. Probably it's at www.archive.org
but that seems unavailable just now.