1. Preliminary criteria for the classification of systemic sclerosis (scleroderma)
2. Classification, prognosis;Medsger,1995
3. Organ involvement: skin;Clements,1995
4. Inter- and intra-observer variability of total skin thickness score (modified-Rodnan) in systemic sclerosis (SSc);Clements;Journal of Rheumatology,1995
5. Severe restrictive lung disease in systemic sclerosis;Steen;Arthritis and Rheumatism,1994