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:Hunter take rates
Hunter take (catch per effort) is a widely applied method for assessing relative abundance of wildlife, including wild swine (Boitani et al. 1994; Fernandez-Llario et al. 2003).
Category: