[[]] starting with @, and check them against the citekeys of all the items whose data has been loaded. If there is a match, you'll be able to right-click on the page reference & bring up a context menu :[[page references]] - not tags, or aliases.
The citation format will transform the reference into an alias, e.g [Scott et al. (2003)]([[@scottQuantitativeMeasurementOrganizational2003]]).
Note that the reverse operation (citation -> citekey) isn't possible due to how Roam represents aliases.