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:…building on the basic elements the Fisher-Ford test have been proposed by Templeton (1974), Schaffer et al. (1977), Gibson et al. (1979), Wilson (1980), Watterson (1982), Waples (1989b), De Koeyer et al. (2001), Goldringer and Bataillon (2004), Wisser et al. (2008), and Sandoval-Castellanos (2010).
Category: