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:Data on the occurrence of the principal mycotoxins on foods and beverages are increasing due to the availability and use of modern and sensitive LC–MS/MS and GC–MS/MS methodologies suitable for simultaneous determination of mycotoxins (Capriotti et al., 2012; Rodríguez-Carrasco et al., 2012).
Category: