Biały, M., Dziewońska, A. and Sroka- Buszydlik, M. (2013) “Reliability of measurement of lumbar multifidus thickness using ultrasonography”, European Journal of Clinical and Experimental Medicine, 11(2), pp. 172–182. Available at: https://journals.ur.edu.pl/ejcem/article/view/12678 (Accessed: 6 June 2026).