Metadata provided by CrossRef is used to create the citation trails. Only records that belong to the collections your institution has activated will appear in the lists of citation trails. In other words, a found record may cite more sources, but you will only see the cited sources that you'll be able to access. The same is true for later sources that cite the found record.
If citation trails are available, you will see them on the Brief Display and the Full Display.
Citing this record
Cited by this record
Using Citation Trails (Ex Libris Knowledge Center)