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That 1984 year doesn't seem to be entirely accurate; at a minimum, the article has had additions since 1984 (including the 1998 death of John Lions).

The abstract notes that it was published in DaemonNews in 1999.

The copy in DaemonNews includes citations that were elided from the copies on cat-v.org and darwinsys.com. Notably, we see that line change from

> (More recently, much of this work has been consolidated into an operating system called Plan 9 From Bell Laboratories.)

to

> (More recently, much of this work has been consolidated into an operating system called Plan 9 From Bell Laboratories.)[Pike1990a, Pike1995a]