BENDÍKOVÁ, Elena et al. The level of muscular system of secondary school pupils in relation to health. In European journal of physical education and sport : scientific journal. - Soči : Academic Publishing House Researcher, 2015. ISSN 2310-0133, 2015, vol. 7, no. 1, pp. 9-16. Available on Internet: <http://ejournal7.com/journals_n/1426866411.pdf>