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:Our water chemistry results are consistent with results published by Basterrechea (1988a) for Lakes SalpeteÃÅn,
 YaxhaÃÅ, Atescatempa, and Ayarza.
Category: