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:…gametophytes and sporophytes, we conducted a preliminary analysis with all Glomus sequences from
Botrychium (Ophioglossaceae; Kovács et al. 2007; Winther and Friedman 2007), Lycopodiaceae (Winther and Friedman 2008) and Psilotum nudum (Psilotaceae; Winther and Friedman 2009) reported in…
Category: