1. Studies on the hemorrhagic sweet clover disease. IV The isolation and crystallization of the hemorrhagic agent;Campbell;J Biol Chem,1941
2. Studies on the hemorrhagic agent 3,3′-methylene-bis-(4-hydroxycoumarin). The effect on the prothrombin and coagulation time of dogs and humans;Bingham;Am J Med Sci,1941
3. Preparation from spoiled sweet clover [3,3′-methylene-bis (4-hydroxycoumarin)] which prolongs coagulation and prothrombin time of blood, preliminary reports of experimental and clinical studies;Butt,1941
4. Oral Anticoagulants;Poller,1996
5. Guidelines on oral anticoagulation: third edition;British Committee for Standards in Haematology;Brit J Haem,1998