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:Under simplifying assumptions, we have analytically shown how disynaptic inhibition that is as fast as mono-synaptic excitation can extend the effective range of inhibitory interactions, in contrast to the recent analytical results showing that in the case of equal synaptic delays on all connections the disynaptic inhibition has negligible effects (Muir and Cook, 2014).
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