Kroodsma refuted
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[1] Donald E. Kroodsma,et al. Patterns in songbird singing behaviour: Hartshorne vindicated , 1990, Animal Behaviour.
[2] Daniel M. Weary,et al. Evidence against the continuity-versatility relationship in bird song , 1988, Animal Behaviour.
[3] D. Kroodsma. Continuity and versatility in bird song: support for the monotony–threshold hypothesis , 1978, Nature.
[4] C. Hartshorne. The Monotony-Threshold in Singing Birds , 1956 .