1. Before defining performance criteria we must agree on what a qualitative test procedures is;Nordin;Clin Chem Lab Med
2. new robust statistical model for interpretation of differences in serial test results from an individual;Braga;Clin Chem Lab Med
3. Defining analytical performance specifications : consensus statement from the st Strategic Conference of the European Federation of Clinical Chemistry and Laboratory;Sandberg;Medicine Clin Chem Lab Med
4. Rationale for using data on biological variation;Ricós;Clin Chem Lab Med
5. Analytical performance specifications for EQA schemes need for harmonisation;Jones;Clin Chem Lab Med