<span class="mw-page-title-namespace">Template</span><span class="mw-page-title-separator">:</span><span class="mw-page-title-main">Siegman73a</span>
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Hermite-Gaussian functions of complex argument as optical-beam eigenfunctions. A. E. Siegman in J. Opt. Soc. Am. 63:1093 (1973).