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:As done in the study [Paxson (1996)], we refer to the collections of route measurements performed during the first and second experiments as D1 and D2, respectively. Paxson used the term “virtual path” to denote the network-level abstraction of a direct link between two Internet sites [Paxson (1996)].
Category: