Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:As Jaeger et al. (1999) noted, several of the dental and mandibular characteristics cited as anthropoid synapomorphies or phenetic resemblances to anthropoids in their original description of the species are found among adapids as well (see Rosenberger et al. 1985; Gebo 2002), in combination.
Category: