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:…changes
to precipitation over adjacent land-masses (Saji and Yamagata, 2003), including East Africa (e.g., Latif et al., 1999; Black et al., 2003; Hastenrath, 2007), India, Indonesia (D’Arrigo and Wilson, 2008), and Australia (Ashok et al., 2003; England et al., 2006; Ummenhofer et al., 2008c).
Category: