I believe Plan9's document formatting applications is pretty much a straight port of those in V10 Research Unix.
"Typing Documents on the UNIX System: using -ms ..." , Lorinda Cherry and Mike Lesk This paper is part of the 10th edition manual, though an online version is linked from the Plan9 wiki or more directly, http://plan9.bell-labs.com/10thEdMan/msdoc.pdf The wiki also links to the tbl grap, pic and a few other papers in the same area. -Steve
