1. Bevington P.R.Data Reduction and Error Analysis for the Physical Sciences. McGraw-Hill, New York 1969; 203–203
2. Blackman R.B., Tukey J.W.The Measurement of Power Spectra. Dover Pubs., Inc., New York 1958; 31–33
3. The Growth of Children
4. Box G.E.P., Jenkins G.M.Time Series Analysis. Holden-Day, Oakland, CA 1976; 36–36