1. Efficacy of spinal manipulation and mobilisation for low back and neck pain;Brønfort,1996
2. Efficacy of spinal manipulative therapy for headache and conditions other than spinal related pain;Brønfort,1996
3. Acute low back problems in adults. Clinical practice guideline no. 14;Bigos,1994
4. Low back pain evidence review;Waddell,1996