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:Abeler et al. (2010) enlarge the scope of this
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critical view on wage equality: interestingly, in their setup it is precisely the presence of fair-minded agents and not their absence that calls for the use of individual rewards.
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