Kim, S., Hwang, S., Kim, B. Julkaisussa Archives of Budo (2020)
Bujak, Z., Miller, J., Litwiniuk, S. Julkaisussa Journal of Combat Sports and Martial Arts (2012)
Bujak, Z., Gierczuk, D., Litwiniuk, S. Julkaisussa Polish Journal of Sport and Tourism (2013)