1. Abramowitz, M., , I. A., Stegun, , Handbook of Mathematical Functions, National Bureau of Standards Applied Mathematics Series 55, second printing November, U. S. Department of Commerce, 1964,
2. Amos, D. E., , L. H., Koopmans, , Tables of the Distribution of the Coefficient of Coherence, Office of Technical Services, U. S. Department of Commerce, 1963,
3. Anderson, T. W., , An Introduction to Multivariate Statistical Analysis, John Wiley & Sons, New York, 1958,
4. Blackman, R. B., , J. W., Tukey, , The Measurement of Power Spectra, paperback, Dover Publications, New York, 1958,
5. An algorithm for the machine calculation of complex Fourier series;Cooley;Mathematics of Computation,1965