@article {1996,
	title = {The semigroup approach to systems of conservation laws},
	journal = {Mat. Contemp. 10 (1996) 21-74},
	number = {SISSA;135/95/M},
	year = {1996},
	publisher = {Sociedade Brasileira de Matematica},
	url = {http://hdl.handle.net/1963/1037},
	author = {Alberto Bressan}
}
