John B. Smith, Stephen F. Weiss, and Gordon J. Ferguson
A hypertext writing environment and its cognitive basis
In: Hypertext '87 Proceedings
Chapel Hill, North Carolina pp. 195-214
ACM Press, November 13-15, 1987
See also: ht87.
Available at http://www.acm.org/pubs/articles/proceedings/hypertext/317426/p195-smith/p195-smith.pdf