1. Mansour, M.M.S.A.: Designing a proposed training program by using the progressive relaxation and its effect on certain sign of muscle tension and performance level of the main skills in ballet. World J. Sport Sci. 3(8), 1174–1180 (2010)
2. Conesa, J.: Electrodermal palmar asymmetry and nostril dominance. Percept. Mot. Skills 80, 211–216 (1995)
3. Manzoni, G.M., Pagnini, F., Castelnuovo, G., Molinari, E.: Relaxation training for anxiety: a ten-year systematic review with meta-analysis. BioMed Cent. Psychiatry 8(41), 1–12 (2008)
4. Charlesworth, E.A., Ronald, G., Nathan, G.: Stress Management: A Comprehensive Guide to Wellness. Ballantine Books, New York (1985)
5. Conrad, A., Roth, W.T.: Muscle relaxation therapy for anxiety disorder: it’s work but how. J. Anxiety Disord. 21, 243–264 (2007)