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:…replication (Anand et al., 1995), with olomoucine, an inhibitor of cyclin-dependent kinase activity (Glab et al., 1994; Meijer, 1996) and by RNAi (Fire et al., 1998; Tabara et al., 1998; Tabara et al., 1999; Grishok et al., 2000; Klink and Wolniak, 2000; Klink and Wolniak, 2001), using dsRNA…
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