PrF UG classes view references
From Protege Wiki
In a complex project, it is possible to have many different relationships between classes, instances, and slots. The References window allows you to view a list of all the frames that reference a value.
Note: For classes, it is also possible to view those classes that are related through one or more slots. See Viewing Class Relations for more information.
Viewing the References Window
To open the References window:
Highlight the item for which you wish to see a list of references. Make sure to go to the correct location:
For a class:
For an instance:
Viewing the Editor for a Reference
To open the Editor for any of the frames shown in the References window:
Viewing References to a Value
To view the references for any of the frames shown in the References window: