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:Their scoring method involves the use of fine-grained POS tags, the Stanford Temporal Tagger (Chang and Manning, 2012), and a number of heuristic rules, which resulted in a confirmation that tense agreement statistics are predictive of implicativeness, illustrated in part by observing a near perfect separation of a list of implicative and non-implicative verbs from Karttunen (1971a).
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