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 found in other restinga areas of the State of Rio de Janeiro, where Eugenia and Erythroxylum (Erythroxylaceae) were pointed out as super host plants (Maia, 2001; Oliveira and Maia, 2005).
Category: