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:To evaluate the proposed algorithm, three annotation refinement methods were compared: WordNet-based method (WNM) [14], Random Walk with Restarts model (RWRM) [22], and the proposed content-based image annotation refinement (CIAR) algorithm.
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