1. and 1966. The Design of Numerical Filters for Geomagnetic Data Analysis, NASA Technical Note D-3341, Washington, DC.
2. 1976. Fourier Analysis of Time Series: An Introduction, Wiley, New York.
3. and 1970. Time Series Analysis: Forcasting and Control, Holden-Day, San Francisco.
4. 1978. Modern Spectrum Analysis, Vol. 1, IEEE Press, New York.
5. Magnetic shielding properties of the Earth's mantle