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:The uniquely rich dataset from Ferizi et al. (2015), acquired on the Connectome system, samples around five thousand points in the space of possible measurements from a standard Stejskal-Tanner DW-MRI sequence.
Category: