Effects of Calcium Ions on the Interactions between Antithrombin and Factor Xa Mediated by Variously Sulfated, Semisynthetic Low-Molecular-Weight Heparins - Sissi, Claudia; Lucatello, Lorena; Naggi, Annamaria; Torri, Giangiacomo; Palumbo, Manlio (Seminars in Thrombosis and Hemostasis, 2002)