@article {SC.4.Shen.1996,
	title = {A System of Conservation Laws Including a Stiff Relaxation Term; the 2D Case},
	journal = {BIT},
	volume = {36},
	number = {4},
	year = {1996},
	pages = {786-813,},
	author = {Shen, W. and Tveito, Aslak and Winther, Ragnar}
}
