@book{15121,
	author = {Guttman, Irwin and Others and Wilks, S. S. ; jt. auth.},
	title = {Introductory engineering statistics},
	publisher = {John Wiley},
	year = {1971},
	series = {Wiley series in Probability and Mathematical Statistics},
	address = {New York},
	edition = {2nd.}
}