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2. Toxic cardenolides: Chemical ecology and coevolution of specialized plant–herbivore interactions;Agrawal;New Phytologist,2012
3. Milkweeds: A conservation practitioners guide;Borders;The Xerces Society for Invertebrate Conservation,2014
4. Fueling the fall migration of the monarch butterfly;Brower;Integrative and Comparative Biology,2006
5. Animal migrations: Endangered phenomena;Brower;American Zoology,1991