@article{Cooper:68,
	title = {Expected {Search} {Length}: \{{A}\} {Single} {Measure} of {Retrieval} {Effectiveness} {Based} on {Weak} {Ordering} {Action} of {Retrieval} {Systems}},
	volume = {19},
	journal = {Journal of the American Society for Information Science},
	author = {Cooper, W S},
	year = {1968},
	pages = {30--41},
}

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