1. Tentative protocol for the evaluation of coagulometers based on one-stage prothrombin time;Shinton, N.K.; Bloom, A.L.; Colvin, B.T.; Flute, P.T.; Preston, F.E.; Kennedy, D.A.;Clin Lab Haematol,1981
2. British Standard 1583: One mark pipettes,1961
3. for Standardisation in Haematology. Recommendations for reference method for haemoglobinometry in human blood (ICSH Standard EP 6/2: 1977) and specifications for international haemiglobincyanide reference preparation;International Committee;J Clin Pathol,1977