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:For the synaptic drive case, as the inputs are probabilistic in nature, in order to achieve a robust comparison, we applied the synaptic input train used by Wolf et al. (2005) to our model and to the model of Wolf et al. (2005) obtained from ModelDB.
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