1. The system for laboratory control of oral anticoagulant therapy using the British comparative thromboplastin;Thomson, J.M.; Chart, L.S.,1970
2. Calibration of five different thromboplastins, using fresh and freeze-dried plasma;Bangham, D.R.; Biggs, R.; Brozovic, M.; Denson, K.W.E.;Thrombosis et Diathesis Haemorrhagica,1973
3. International Committee for Standardization in Haematology. Prothrombin time standardization: report of the expert panel on oral anticoagulant control;International Committee on Thrombosis and Haemostasis;Thromb Haemost,1979
4. Calibration of reference thromboplastin and standardization of the prothrombin time ratio;Kirkwood, T.B.L.;Thromb Haemost,1983
5. Expert Committee on Biological Standardization. Requirements for thromboplastins and plasma used to control oral anticoagulant therapy;WHO,1983