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:…1978; Jones, 2000), annual water loss (e.g., Bosch and Hewlett, 1982; Komatsu, 2003), subsurface stormflow volume (Freer et al., 2002), the relationship between upslope pore pressure dynamics and
hillslope discharge (Uchida et al., 2004) or event water ratio (e.g., Pearce, 1990; Buttle, 1994).
Category: