Signalling structure in hypertext: support for the non-native reader
L. Hunter
http://www.info.kochi-tech.ac.jp/lawrie/signalindex.htm
Dimensions of Media Object Comprehensibility (L. Hunter)
IEEE ICALT 2007
https://slideplayer.com/slide/7071331/
Patterns of Hypertext
Mark Bernstein
http://www.eastgate.com/patterns/
StorySpace hypertext software
http://www.eastgate.com/storyspace/index.html
Lawrie Hunter 