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:context (Cooper et al. 1994; Coggon et al. 2000; Sandmark et al. 2000; Seidler et al. 2008; Klussmann et al. 2010).
Category: