Treatment of refractory Wegener's granulomatosis with antithymocyte globulin (ATG): an open study in 15 patients - Schmitt, W H; Hagen, E C; Neumann, I; Nowack, R; Flores-Suárez, L F; van der Woude, F J (Kidney Int, 2004)
; European Vasculitis Study Group.