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:Serial imaging and necropsies revealed cavities within the necrotic center of organized caseous lesions situated within larger zones of caseous pneumonia, findings described in other models of cavitary TB (Kübler et al., 2015; Via et al., 2013), and in affected humans (Canetti, 1955).
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