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:Devore’s polynomials over finite fields[18]; Gao F’s algebraic curves [19]; Amini and Marvasti’s bipolar matrix by BCH code [20] and its generalization [21]; Bourgain’s additive combinatorics[16].
Category: