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:For the individual species mapping approach, predictive models were developed from the museum occurrence data using the GARP modeling system (Stockwell and Noble, 1992; Stockwell and Peters, 1999; Stockwell, 1999).
Category: