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:First characterized by Meis-Kindblom in 1995 (Meis-Kindblom et al., 1995), sclerosing epithelioid fibrosarcoma (SEF) is a rare soft tissue tumor exhibiting a characteristic morphologic pattern of epithelioid cells arranged in strands, cords, nests, and sheets embedded in a sclerosed and hyalinized…
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