1. Fisher RA: The Design of Experiments. 1935, Edinburgh: Oliva and Boyd
2. Beller EM, Gebski V, Keech AC: Randomization in clinical trials. MJA. 2002, 177: 565-567.
3. Burger VW, Christophi CA: Randomization Technique, Allocation Concealment, Masking, And Suspectibility Of Trials To Selection Bias. JMASM. 2003, 2: 80-86.
4. Box GEP, Guttman I: Some aspects of randomization. RSS Series B. 1966, 28: 543-558.
5. Taves DR: Minimization: a new method of assigning patients to treatment and control groups. Clinical Pharmacology and Therapeutics. 1974, 15: 443-453.