References
- Tango T. An interpretation of normal ranges based on a new concept ‘individual difference quotient’ of clinical laboratory data. Medical Informatics 1981; 6: 161–174
- Johnson N. L., Korz S. Distributions in Statistics: Continuous Univariate Distributions‐2. John Wiley & Sons, New York 1970, especially chapter 29
- Ruben H. Probability content of regions under spherical normal distributions, IV: The distribution of homogeneous and non‐homogeneous quadratic functions of normal variables. Annals of Mathematics and Statistics 1962; 33: 542–570