An article in the May 1997 Wired available on the web
Digital Ink by Charles Platt
http://wwww.wired.com/wired/5.05/features/ff_digitalink.html
Earlier Negroponte mentioned this research in his back page
Wired column of February 1996
http://wwww.wired.com/wired/4.02/negroponte.html
Another column from January 1997
Coauthored by Negroponte and Joe Jacobson
Surfaces and Displays
http://wwww.wired.com/wired/5.01/negroponte.html
Gregory Sullivan