olemus
viide samas allikas olevale objektile

Wiktionary:
a reference or direction in one place in a book or other source of information to information at another place in the same work

ISO 999:
suunamine ühelt (ala)pealkirjalt teisele
= direction from one heading or subheading to another

ülevaateid
https://en.wikipedia.org/wiki/Cross-reference

https://support.litera.com/s/article/Cross-reference-types-relative-absolute-and-blank