1. Abelson, R. P. Spectral analysis and the study of individual differences in the performance of routine, repetitive tasks. Princeton: Educ. Test. Serv., 1953.
2. Flynn, J. P. Lack of randomness in sequences of auditory differential threshold data.Amer. Psychologist, 1948,3, 254. Abstract.
3. Grant, D. A. The discrimination of sequences in stimulus events and the transmission of information.Amer. Psychologist, 1954,9, 62–68.
4. Hartley, H. O. The application of some commercial calculating machines to certain statistical calculations.Supp. J. roy. statist. Soc., 1946,8, 154–183.
5. Schipper, L. M. and Gruenberger, F. A method of calculation of serial correlation coefficients utilizing the IBM Card-Programmed Electronic Calculator.Res. Bull. 53-10, 6564th Research and Development Group, HRRC, Air Research and Development Command, Lackland Air Force Base, Texas, May, 1953.