@book{18992,
	author = {Díaz de Cossío, Roger. and Siess, C. P.},
	title = {Development of desing criteria for reinforced concerte box culvests, R.D.C. and C.P. Siess},
	publisher = {University of Illinois,},
	year = {1958-59},
	series = {Civil Engineering studies Structural research series, 163-164},
	address = {Urbana, Ill. :}
}