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:These results seem contradictory to the results of a study by Matjaƒçiƒá and Olen≈°ek [14], who studied artificially induced crouch walking in healthy adults by means of a psoas and hamstrings contraction emulation system.
Category: