7Baskova IP,Khalil' S,Nikonov GI.Effect of the salivary gland secretion of medicinal leeches hirudo medicinalis on the external and internal mechanisms of blood coagulation[J].Biull Eksp Biol Med,1984,97 (8):142-143.
8Markwardt F.Hirudin as an inhibitor of thrombin[J].Methods Enzymol,1970,19:924-932.