References
- Hanna, R. W., and Varnum, R. C., “Interference Risk when Normal Distributions Overlap,” Industrial Quality Control, Vol. 7, No. 2, September 1950, pp. 26–28.
- Sheffler, R. J., “Setting Tolerances Realistically,” Annual Technical Conference Transactions, American Society for Quality Control, 1962, pp. 577–584.