By Marshall Susan H.   Smith Donald R.   in Mathematics Magazine

ISSN:1930-0980|86|3|189-203

Mathematical Association of America‎(2013)‎

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By Smith Donald R.   Loewenstein Ernest V.   in Applied Spectroscopy

ISSN:0003-7028|30|3|303-305

Society for Applied Spectroscopy‎(1976)‎

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