1. Fundamentals of blood coagulation in clinical medicine;Hougie,1963
2. Automated versus manual techniques for the prothrombin time test: Results of proficiency assessment studies;Poller;Br J Haematol,1978
3. Hematology;Koepke,1978
4. Laboratory diagnosis, tests of clotting function and their standardization;Denson,1976
5. Effect of thromboplastin and instrumentation on the prothrombin time test;Evatt;Clin Lab Hematol,1981