@book{547487,
	author = {Krizek, Raymond J.},
	title = {Structural analysis and design of pipe culverts},
	publisher = {Highway Research Board, National Research Council,},
	year = {1971.},
	series = {National Cooperative Highway Research Program. Report},
	address = {Washington]},
	note = {"Research sponsored by the American Association of State Highway Officials in cooperation with the Federal Highway Administration."}
}