1Powell FC,Su WP.Derry HO Pyoderma gangrenosun: a report of 44 cases with follow-up.Br J Dermatol,1997;137:1000
2E.A Cooks and P.von den driesch. pyoderma gangrenosum in a patient with autoimmune haemolytic anaemia and complement deficiency . British Journal of Dermatology,2000;143:154-156
