The calculus of individuals and its uses. Leonard, H. S. & Goodman, N. JSL, 5:45–55, 1940.
bibtex   
@article{Leonard+Goodman:1940,
	author = "Leonard, Henry S. and Goodman, Nelson",
	year = "1940",
	title = "The calculus of individuals and its uses",
	journal = jsl,
	volume = "5",
	_number = "2",
	pages = "45--55"
}

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