Studies on the inhibitory effects of heparin, hirudin or OM-189 (synthetic thrombin inhibitor by Okamoto) on the serine proteinases (thrombin, trypsin, factor Xa and plasmin) by the method using synthetic chromogenic substrate, (jap) - Sakuragawa, N; Takahashi, K; Ashizawa, T; Matsuoka, M (Blood & Vessel (Tokyo), 1978)