The Mitoxantrone in Multiple Sclerosis Study Group (MIMS) - Hartung, HP; Gonsette, R; Köanig, N; Kwiecinski, H; Guseo, A; Morrissey, SP; Krapf, H; Zwingers, T (Mitoxantrone in progressive multiple sclerosis: a placebo-controlled, double-blind, randomised, multicentre trial. The Lancet, 2002)