00395nas a2200157   4500000000100000000000100001008004100002653000900043100002000052700001900072700001500091245003200106856007800138300001400216490000700230       1993                            d10adblp1 aLeandro Navarro1 aWolfgang Prinz1 aTom Rodden00aCSCW requires open systems.  uhttp://dblp.uni-trier.de/db/journals/comcom/comcom16.html$\\#$NavarroPR93  a288–2970 v16