1. Buckingham, R. A.: Numerical methods. London: Pitman 1957.
2. Chrystal, George: A textbook of algebra, v. 2. New York: Dover 1964.
3. Craig, C. C.: Note on the use of fixed numbers of defectives and variable sample sizes in sampling by attributes. Industrial Quality Control9, 43–45 (1953). (Mentioned in [14].)
4. Henrici, P.: Elements of numerical analysis. New York: Wiley 1967
5. —— Discrete variable methods in ordinary differential equations. New York: Wiley 1962.