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http://journals.cambridge.org/action/displayAbstract?aid=41323
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M. T. Carrano
(1999).
What, if anything, is a cursor? Categories versus continua for determining locomotor habit in mammals and dinosaurs. Journal of Zoology, 247
,
pp 29-42
doi:10.1111/j.1469-7998.1999.tb00190.x