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:Other sources of MF and SB input to the GCD are the lateral reticular nucleus, the pontine nuclei and inferior olive (Weinberg and Rustioni, 1987; Zhou and Shore, 2004; Ryugo et al., 2003), as well as the contralateral CN (Zhou et al., 2010).
Category: