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:In Hutt and Longtin (2010) a simplified cortical meanfieldmodel is used to demonstrate analytically that bi-phasic responses are a general property of neural meanfields comprising excitatory and inhibitory neurons types, linear synaptic dynamics, and non-linear activation functions.
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