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:The results of the present dead weight noise testing indicate that the ‚ÄòCoP path velocity‚Äô noise of the WBB (4.1‚Äì5.3 mm s 1) is considerable, which is in accordance with Pagnacco et al. (2011).
Category: