Kolimechkov, Stefan, Iliya Yanev, Iliya Kiuchukov, and Lubomir Petrov. 2021. “KINEMATIC ANALYSIS OF DOUBLE BACK STRAIGHT SOMERSAULT AND DOUBLE BACK STRAIGHT SOMERSAULT WITH FULL TWIST ON RINGS”. Science of Gymnastics Journal 13 (2): 191-202. https://doi.org/10.52165/sgj.13.2.191-202.