'See also' Cross-References
http://www.allegrotechindexing.com/news004.htm

Brown, Fred
Allegro Time!
2000

Abstract:

'See also' cross-references assist the user to quickly navigate to the right index term. The same principles that apply to 'See also' cross-references apply equally to hypertext linking. 'See also' cross-references are constructed using the following relationships: a broader term to a narrower term, e.g. 'mammals, See also whales'; sailing craft, See also hulls overlapping meaning between two terms, e.g. 'gold, See also money'