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:…(Balana et al., 2011; Bottcher et al., 2012; Cai et al., 2011; Ghai et al., 2013; Ghai et al., 2011; Hayashi et al., 2012; Joubert et al., 2004; Knauth et al., 2005; Lauffer et al., 2010; Lunn et al., 2007; Steinberg et al., 2013; Temkin et al., 2011; Valdes et al., 2011; Wang et al., 2013).
Category: