@article {ARC22652,
	title = {Helmets and invisible armor: structures reducing predation from tactile and visual planktivores},
	journal = {Ecology},
	volume = {60},
	year = {1979},
	pages = {287-294},
	keywords = {ARC},
	doi = {10.2307/1937657},
	author = {W. John O{\textquoteright}Brien and D. Kettle and H. Riessen}
}
