Drummond PD, Finch PM, Smythe GA: Reflex sympathetic dystrophy: the significance of differing plasma catecholamine concentrations in affected and unaffected limbs. Brain 114 (Pt 5): 2025-2036, 1991
Merskey H, Bogduk N: Classification of chronic pain: descriptions of chronic pain syndromes and definitions of pain terms. Seattle, IASP Press, 1994
Bruehl S, Harden RN, Galer B, et al: Factor analysis of signs and symptoms of complex regional pain syndrome: a partial validation of IASP diagnostic criteria and suggestions for change. Neurology 50 (Suppl 4): A 254, 1998