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:Thus, the Andean uplift greatly influenced biodiversity organization in South America (Gentry 1982; Hoorn et al. 1995, 2010; Jørgensen & Le onY anez 1999; Antonelli et al. 2010).
Category: