1. SUNDERMAN FW (1975) Current concepts of “normal values”, “reference values”, and “discrimination values” in clinical chemistry. Clin Chem 21:1873–1877
2. ROBERTS LB (1967) The normal ranges, with statistical analysis for seventeen blood constituents. Clin Chim Acta 16:69–78
3. FILES JB, VAN PEENEN HJ, LINDBERG DA (1968) Use of “normal range” in multiphasic testing. JAMA 205:684–688
4. KEATING FR, JONES JD, ELVEBACK LR, RANDALL RV (1969) The relation of age and sex to distribution of values in healthy adults of serum calcium, inorganic phosphorus, magnesium, alkaline phosphatase, total proteins, albumin, and blood urea. J Lab Clin Med 73:825–834
5. WERNER M, TOLLS RE, HULTIN JV, MELLECKER J (1970) Influence of sex and age on the normal range of eleven serum constituents. Z Klin Chern Klin Biochem 8:105–115