Megova, T., N. Mihaylova, M. Filipova, D. Popova, and L. Kraydjikova. “PHYSIOTHERAPY”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 29, no. 1, Aug. 2016, pp. 238-41, https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/6018.