1. The implementation of an evacuated blood collection system;Mead, S.V.;Medical Laboratory World,1983
2. Unsuitability of evacuated tubes for monitoring heparin therapy by activated partial thromboplastin time;ADuP, Heyns; van Der Berg DJ; PHT, Kleynhans; PW, Tait;J Clin Pathol,1981
3. Blood specimen collection tubes for coagulation tests (Letter);Blackburn, E.K.; Shinton, N.K.;Br Med J,1979
4. A laboratory manual of blood coagulation;Austen, D.E.G.; Rhymes, I.L.,1975
5. Bleeding disorders-investigation and management;Hardisty, R.M.; Ingram, G.I.C.,1965