Comparison of the in vivo anticoagulant properties of standard heparin and the highly selective factor Xa inhibitors antistasin and tick anticoagulant peptide (TAP) - Vlasuk, G P; Ramjit, D; Fujita, T; Dunwiddie, C T; Nutt, E M; Smith, D E; She-buski, R J (Thromb Haemost, 1991)