@book{216907,
	author = {Torres Tur, Elías and Universitat Politècnica de Catalunya.},
	title = {Luz cenital /},
	publisher = {ACTAR ,},
	year = {2005},
	address = {Barcelona :},
	note = {Originally presented as the author's thesis (doctoral--Universitat Politècnica de Catalunya,1993) under the same title.}
}