Valasek, T., Varga, P. P., Szövérfi, Z., Kümin, M., Fairbank, J., & Lazary, A. (2013). Reliability and validity study on the Hungarian versions of the Oswestry Disability Index and the Quebec Back Pain Disability Scale. Springer-Verlag.

Valasek, Tamás, Peter Paul Varga, Zsolt Szövérfi, Michelle Kümin, Jeremy Fairbank, and Aron Lazary. Reliability and Validity Study On the Hungarian Versions of the Oswestry Disability Index and the Quebec Back Pain Disability Scale. Springer-Verlag, 2013.

Valasek, Tamás, et al. Reliability and Validity Study On the Hungarian Versions of the Oswestry Disability Index and the Quebec Back Pain Disability Scale. Springer-Verlag, 2013.