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 effectiveness of our approach, we conduct extensive experiments on three commonly used datasets that provide multiple feature representations, including Oxford Flowers17 dataset (Nilsback and Zisserman 2006), Oxford Flowers102 dataset (Nilsback and Zisserman 2008) and Caltech101 dataset (Fei-Fei, Fergus, and Perona 2007).
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