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:Our results are not consistent with the taxonomic proposals of Klein (2004) and Delforge (2009), even with the former proposal of Tyteca and Klein (2008), although these authors (Tyteca and Klein 2009) accepted the enlarged genus Anacamptis sensu Bateman et al. (2003).
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