1. System ISI calibration: a universally applicable scheme is only pos sible when coumarin plasma calibrants are used;Stevenson, K.J.; Craig, S.; Dufty, J.M.K.; Taberner, D.A.;Br]_ Haematol,1997
2. Assessment of value of calibrated lyophilised plasmas to determine International Sensitivity Index for coagulometers;Clarke, K.; Taberner, D.A.; Thomson, J.M.; Morris, J.A.; Poller, L.;Clin Pathol,1992
3. Expert Committee on Biological Standardisation. 33rd Report. WHO Techn Rep Ser;WHO,1983
4. AK calibrants. A step forward in the standardisation of the INR;Moritz, B.; Lang, H.,1995
5. Local calibration for INR determination: results of a 349 laboratory collaborative study;Kitchen, S.; Jennings, I.; Woods, T.A.L.; Preston, F.E.