Müller, Gerhard, Manuela Pfinder, Michael Clement, Andreas Kaiserauer, Guido Deis, Timm Waber, Stefanie Rieger, et al. 2018. “Therapeutic and Economic Effects of Multimodal Back Exercise: A Controlled Multicentre Study”. Journal of Rehabilitation Medicine 51 (1):61-70. https://doi.org/10.2340/16501977-2497.