Butterflies and Plants: A Study in Coevolution. Ehrlich, P. R. & Raven, P. H. Evolution, 18(4):586–608, 1964.
Butterflies and Plants: A Study in Coevolution [link]Paper  doi  bibtex   
@article{ehrlich_butterflies_1964,
	title = {Butterflies and {Plants}: {A} {Study} in {Coevolution}},
	volume = {18},
	copyright = {© 1964 The Society for the Study of Evolution},
	issn = {1558-5646},
	shorttitle = {Butterflies and {Plants}},
	url = {http://onlinelibrary.wiley.com/doi/abs/10.1111/j.1558-5646.1964.tb01674.x},
	doi = {10/gfwnhg},
	language = {en},
	number = {4},
	urldate = {2019-05-03},
	journal = {Evolution},
	author = {Ehrlich, Paul R. and Raven, Peter H.},
	year = {1964},
	pages = {586--608},
}

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