Punching power: A Medical Doctor Examines Karate-Do and Karate-Jutsu to Find Out Which System Has a Better Punch
http://www.downloadkarate.com/karate-articles/punching-with-snap-and-elbow-lock–is-it-traditional–elbow-injuries
http://www.ryusei-karate.com/english/newsletters/fusion.html
http://www.adamhsu.com/articles/taiwanblog_FaJing1.html
http://ryukyuma.blogspot.ru