Put, M., J. Huber, M. Pieniazek, A. . Gadek-Michalska, and A. Szczygiel. “A Randomized Clinical Trial of Multimodal Therapy and Mulligan’s Concept of Manual Therapy for Patients With Chronic Pain Syndrome Caused by Upper Cervical Spine Disorders”. International Journal of Orthopedics and Rehabilitation, vol. 3, no. 1, June 2016, pp. 35-41, doi:10.12974/2313-0954.2016.03.01.6.