Serrano Rodrigues, L., J. A. Cursiol, and C. R. A. Barreira. “Subjective boundaries between fight and violence in the experience of professional MMA fighters”. Revista de Artes Marciales Asiáticas, vol. 16, no. 1, May 2021, pp. 33-46, doi:10.18002/rama.v16i1.6488.