The method of stationary phase (MSP), which is an asymptotic method of integration, nevertheless yields general (nonasymptotic) results when applied to certain integrals involving the spherical function. In such cases one may drop the requirement of far-field or high frequency from the results. Copyright © 1973 by The Institute of Electrical and Electronics Engineers. Inc.
B. Park, "On The Method Of Stationary Phase," Proceedings of the IEEE, vol. 61, no. 8, p. 1165, Institute of Electrical and Electronics Engineers, Jan 1973.
The definitive version is available at https://doi.org/10.1109/PROC.1973.9237
Electrical and Computer Engineering
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01 Jan 1973