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Journal Article Numerical Phenetics and Taxonomic Theory Get access Ernst Mayr Ernst Mayr Search for other works by this author on: Oxford Academic PubMed Google Scholar Systematic Biology, Volume 14, Issue 2, June 1965, Pages 73–97, https://doi.org/10.2307/2411730 Published: 01 June 1965
Ernst Mayr (Tue,) studied this question.