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:Since these applications rely on the dynamical behaviors of the equilibrium point of the CGNNs, it is very important to investigate the stability of CGNNs and a large number of results have been discussed, see [2, 3, 4, 5, 6, 7].
Category: