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The online version of the original article can be found at http://dx.doi.org/10.1007/BF02479050
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Ling, R.C. Letter to the editor. Bulletin of Mathematical Biophysics 27, 114 (1965). https://doi.org/10.1007/BF02476475
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DOI: https://doi.org/10.1007/BF02476475