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:) (Burdette and Whitaker, 2005; Carver et al., 2008; Ding et al., 2011; Gomez et al., 2004; Molnar et al., 2004; Mota et al., 2005).
Category: