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Riddle, Oscar, Hollander, Willard Fisher (June 1943) "Scraggly" plumage and ataxia: two inherited characters in the pigeon. The Journal of Heredity, 34 (6). pp. 167-172.
Hollander, Willard Fisher (January 1943) A possible case of directed mutation in the pigeon (Abstract). Genetics, 28 (1). pp. 76-77.