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:The composite maps were generated through further development of previously reported navigation [Kinsey and Whitcomb, 2004] and sonar processing routines [Ballard et al., 2000; Whitcomb et al., 2000; Singh et al., 2000], and are nested within the existing ABE bathymetry data collected at 9 500N [Yoerger et al.
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