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:…Spanish, as spoken in Madrid (Estebas-Vilaplana, 2006; Estebas-Vilaplana & Prieto, 2007), Salamanca (de la Mota, 2005), and Majorca (Simonet & Torreira, 2005; Simonet, 2006), and on Central Catalan as spoken in Barcelona (Estebas-Vilaplana, 2003; Estebas-Vilaplana & Prieto, 2007; Prieto, 2006).
Category: