@article {7537,
	title = {Effects of competition on rates of evolution, with special reference to bivalve mollusks and mammals},
	journal = {Systematic Zoology},
	volume = {22},
	number = {4},
	year = {1973},
	note = {PDF},
	pages = {486-506},
	keywords = {bivalvia, competition, diversification, evolution, rates},
	author = {Stanley, Steven M.}
}
@article {6378,
	title = {Clams and brachiopods - ships that pass in the night},
	journal = {Paleobiology},
	volume = {6},
	number = {4},
	year = {1980},
	note = {PDF},
	pages = {383-396},
	keywords = {brachiopoda, competition, ecology, evolution, extinction, macroevolution, mollusca},
	author = {Gould, Stephen Jay and Calloway, C. Bradford}
}
