[1] M. Abramowitz and I. A. Stegun (Eds.), Handbook of Mathematical
Functions with Formulas, Graphs, and Mathematical Tables, 9th
Printing, Dover, New York, (1972), 255-258.
[2] A. Papoulis, Probability, Random Variables, and Stochastic
Processes, 2nd Edition, McGraw-Hill, New York, (1984), 145-149.
[3] W. H. Press, B. P. Flannery, S. A. Teukolsky and W. T. Vetterling,
Linear Correlation, 4.5 in Numerical Recipes in FORTRAN: The Art of
Scientific Computing, 2nd Edition, Cambridge University Press,
Cambridge, England, (1992), 630-633.
[4] R. H. Shumway and D. S. Stoffer, Time Series Analysis and its
Applications, with R Examples, 2nd Edition, Springer-Verlag, New York,
2000.
[5] Eric W. Weisstein, MathWorld-A Wolfram Web Resource.
http://mathworld.wolfram.com/TimeSeriesAnalysis.htm
l