Bal-Bocheńska, M., Wolan, A. and Kwolek, A. (2009) “Assessment of efficiency of respiratory tract cleaning in children with mucoviscidosis”, European Journal of Clinical and Experimental Medicine, 7(1), pp. 31–36. Available at: https://journals.ur.edu.pl/ejcem/article/view/13204 (Accessed: 24 June 2026).