Three abnormal fibrinogen variants with the same amino acid substitution (γ 275 Arg ⟶ His): fibrinogens Bergamo II, Essen and Perugia - Reber, P; Furlan, M; Henschen, A; Kaudewitz, H; Barbui, T; Hilgard, P; Nenci, G G; Berrettini, M; Beck, E A (Thromb Haemost, 1986)