Wojdat, Marta, and Roman Ossowski. “Comparative Analysis of the level’s Aggression of Women and Men Training Brazilian Jiu - Jitsu in the Light of the Possibilities for Therapeutic Purposes”. Journal of Education, Health and Sport, vol. 9, no. 5, May 2019, pp. 319-38, https://apcz.umk.pl/JEHS/article/view/6931.