@article{EJDE_2003__2003__a174,
     author = {Junk,  Michael},
     title = {On \(2\times 2\) systems of conservation laws with fluxes that are entropies},
     journal = {Electronic journal of differential equations},
     year = {2003},
     volume = {2003},
     zbl = {1028.35099},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2003__2003__a174/}
}