@article {1517,
	title = {Observations on the fine structure of photoreceptor cells in the planarian Dugesia tigrina},
	volume = {10},
	year = {1964},
	month = {1964//},
	url = {http://dx.doi.org/10.1016/S0022-5320(64)80013-7},
	author = {MacRae, E. K.}
}
