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:Some of these configurations are: 3D simulated catalytic gauze, e.g., (Rinnemo et al., 1997), (Quiceno et al., 2006), 1D simulated catalytic foam, e.g., (Horn et al., 2007), (Dalle Nogare et al., 2011), (Korup et al., 2013), 3D simulated channel with catalytic walls, e.g., (Sa et al., 2010),…
Category: