References
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- Van den Besselaar A MHP, Gralnick H R, Lewis S M. Thromboplastin calibration and oral anticoagulant control. Martinus Nijhoff Publ., The Hague 1984
- WHO Expert Committee on Biological Standardization. WHO, Geneva 1983; 81–105, Thirty-third Report. Technical Report Series 687
- WHO Expert Committee on Biological Standardization. WHO, Geneva 1984; 19, Thirty-fourth Report. Technical Report Series 700