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:This research used the prediction function of Sutheebanjard and Premchaiswadi [5] where the important factors namely, the Down Jones index, the Hang Seng index, the Nikkei index and domestic MLR were taken into account as shown in (2).
Category: