T. A. Green, S. Skowron- Markowska, W. Cynarski, C. Gutiérrez García, A. Figueiredo, and J. Simenko, “Qualitative and quantitative methods in the study of martial arts and combat sports: a panel based on personal experiences”, Rev. artes marciales asiát., vol. 14, no. 2s, pp. 79–83, Nov. 2019.