@incollection {D:hier,
	title = {Do we need a hierarchical model of science?},
	booktitle = {Inference, Explanation, and Other Frustrations. {E}ssays in the Philosophy of Science},
	year = {1992},
	pages = {199{\textendash}215},
	publisher = {University of California Press},
	author = {Batens, Diderik},
	editor = {Earman, John}
}
