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:We evaluate the performance of our approach on three public datasets: UTKinect-Action [Xia et al. 2012], MSR-Action3D [Li et al. 2010] and Florence3D-Action [Seidenari et al. 2013].
Category: