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:Other mutations in the sgl locus were identi®ed as demonstrating a cuticle phenotype similar to that of wingless (wg) mutants (HaÈ cker et al. 1997; Haerry et al. 1997).
Category: