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:For example, although Vieira et al. (2006) listed most mites in mixed habitat associations, we found that 12 mite taxa showed clear pool versus riffle affinities, contributing to our knowledge of the habitat associations of this group. Similarly, 13 of the opposite discrepancies between our results and the Merritt et al. (2008) scheme were for Chironomidae taxa and a perusal of the Merritt et al. (2008) references for chironomid designations indicated that assignments were often based on considerations of general group
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