References (SPECTRA command)
Bloomfield, P. 1976. Fourier analysis of time series. New York: John Wiley and Sons.
Fuller, W. A. 1976. Introduction to statistical time series. New York: John Wiley and Sons.
Gottman, J. M. 1981. Time-series analysis: A comprehensive introduction for social scientists. Cambridge: Cambridge University Press.
Priestley, M. B. 1981. Spectral analysis and time series, volumes 1 and 2. London: Academic Press.