Hunter, R.S. (1948) Proceedings of the Thirty-Third Annual Meeting of the Optical Society of America. Journal of the Optical Society of America, 38, 1092-1106.
https://www.osapublishing.org/josa/abstract.cfm?uri=josa-38-12-1092
https://doi.org/10.1364/JOSA.38.001092

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