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:…Comparative algorithms
Most of exiting dynamic evolutionary algorithms were applied to moving peaks benchmark problem (MPB) (Mendes and Mohais 2005; Bui et al. 2005; Blackwell and Branke 2006; Moser and Hendtlass 2007; Woldesenbet and Yen 2009; Daneshyari and Yen 2011; Li and Yang 2012; Sharifi et…
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