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:Giles (2005) found almost 14,000 citations in WoS for a paper in Science by Saiki et al. (1988) on the polymerase chain reaction, identifying it as the most highly cited paper ever to appear in that journal, whereas GS returned just under 3000 citations.
Category: