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:Similar results were reported by Lima et al. (2011) when using fruit extracts, and by NazaÃÅrio (2011), when using extracts from recalcitrant seeds of the palm tree Bactris gasipaes.
Category: