New general approach for determining the solution structure of a ligand bound weakly to a receptor: structure of a fib-rinogen Aalpha-like peptide bound to throm-bin (S195A) obtained using NOE distance constraints and an ECEPP/3 flexible docking program - Maurer, MC; Trosset, JY; Lester, CC; DiBella, EE; Scheraga, HA (Proteins, 1999)