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:In this paper, AAUC is computed over the first 15 recall points:
 AAUC = 1
 15 ¬∑ 15‚àë i=1 Precision(i).
Category: