What does HA stand for?

MLA style: "HA." Acronym Finder . 2012. AcronymFinder.com 30 May. 2012 http://www.acronymfinder.com/Harmonic-Approximation-(HA).html
Chicago style: Acronym Finder . S.v. "HA." Retrieved May 30 2012 from http://www.acronymfinder.com/Harmonic-Approximation-(HA).html
APA style: HA. (n.d.) Acronym Finder. (2012). Retrieved May 30 2012 from http://www.acronymfinder.com/Harmonic-Approximation-(HA).html

Harmonic Approximation

This definition appears very rarely and is found in the following Acronym Finder categories:

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Samples in periodicals archive:

Later chapters cover method developments based on or inspired by NMA but going beyond the harmonic approximation inherent in standard NMA techniques.