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Haefeli, Mathias; Elfering, Achim; McIntosh, Emma; Gray, Alastair; Sukthankar, Atul; Boss, Norbert (2008). A Cost-Benefit Analysis Using Contingent Valuation Techniques: A Feasibility Study in Spinal Surgery. Value in health, 11(4), pp. 575-588. New York, N.Y.: Elsevier 10.1111/j.1524-4733.2007.00282.x
Haefeli, Mathias; Elfering, Achim (2006). Pain assessment. European spine journal, 15(Supplement 1), pp. 17-24. Berlin: Springer 10.1007/s00586-005-1044-x
Haefeli, Mathias; Elfering, Achim; Kilian, Reinhold; Min, Kan; Boos, Norbert (2006). Nonoperative treatment for adolescent idiopathic scoliosis: A 10- to 60-year follow-up with special reference to health-related quality of life. Spine, 31(3), pp. 355-366. Hagerstown, Md.: Lippincott Williams & Wilkins 10.1097/01.brs.0000197664.02098.09
