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2. On the Various Contrivances by Which British and Foreign Orchids are Fertilised by Insects, and on the Good Effects of Intercrossing;Darwin,1862
3. Butterflies and plants: a study in coevolution;Ehrlich;Evolution,1964
4. When is it coevolution?;Janzen;Evolution,1980
5. Experimental coevolution of species interactions;Brockhurst;Trends Ecol. Evol.,2013