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Journal Article Principles of Systematic Zoology Get access Principles of Systematic Zoology. — Ernst Mayr McGraw-Hill Book Co. , New York. 1969), xi + 428 pp. Price12. 50. Charles D. Michener Charles D. Michener Search for other works by this author on: Oxford Academic PubMed Google Scholar Systematic Biology, Volume 18, Issue 2, June 1969, Pages 232–234, https: //doi. org/10. 2307/2412606 Published: 01 June 1969
Michener et al. (Sun,) studied this question.