GRZEGORCZYK, Michał, KWIATKOWSKI, Piotr and MAJCHER, Piotr. Subjective assessment of the effectiveness of physiotherapeutic methods in lumbosacral discogenic pain syndrome. Journal of Education, Health and Sport. Online. 6 March 2018. Vol. 8, no. 3, pp. 164-192. [Accessed 27 July 2024].