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:‚Ä¶farm (MSHR0169) was
 performed using MGAP (https://github.com/dsarov/MGAP‚Äî Microbial-Genome-Assembler-Pipeline), a tool that incorporates Velvet (Zerbino & Birney, 2008), VelvetOptimiser (https://github.com/tseemann/VelvetOptimiser), GapFiller (Boetzer & Pirovano, 2012), ABACAS (Assefa et al.,‚Ä¶
Category: