@article {SC.4.Tveito.1995,
	title = {The Solution of Nonstrictly Hyperbolic Systems of Conservation Laws May Be Hard to Compute},
	journal = {SIAM J. Sci. Comput.},
	volume = {16},
	year = {1995},
	pages = {320-329,},
	author = {Tveito, Aslak and Winther, Ragnar}
}
