Ioannidou Ανατολή, Dakis Ευάγγελος, Nikodelis Θωμάς, and Papaiakovou Γεώργιος. 2010. “Kinematical and Dynamic Differences by Executing Basic Steps on Stable and Unstable Surface”. Inquiries in Physical Education and Sport 8 (2):181-88. https://journals.lib.uth.gr/index.php/inquiries/article/view/1355.