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:1991), allozymes (Jaaska 1980, 1981; Dudnikov 2000; Dudnikov and Kawahara 2006), AFLP (Saeidi et al. 2008; Mizuno et al. 2010), SSR (Pestsova et al.
Category: