Scriber, J. M., A. Stump, and M. Deering. 2003. Hybrid zone ecology and tiger swallowtail trait clines in North America. Pages 367-391 in C. Boggs, W. Watt, and P. Erlich, eds. Ecology and Evolution Taking Flight: Butterflies as Model Study Systems. University of Chicago Press, Chicago, Illinois, USA.
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