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 values of the free parameters mij ∈ [0, 2], bij ∈ [0, 1], and aij ∈ [−2, 2] are searched to find a betterperformed fuzzy predictor.
Category: