@article {2002,
	title = {Admissible Riemann solvers for genuinely nonlinear P-systems of mixed type},
	journal = {J. Differ. Equations, 2002, 180, 395},
	number = {SISSA;33/00/M},
	year = {2002},
	publisher = {SISSA Library},
	doi = {10.1006/jdeq.2001.4066},
	url = {http://hdl.handle.net/1963/1491},
	author = {Jean-Marc Mercier and Benedetto Piccoli}
}
@article {2001,
	title = {Global continuous Riemann solver for nonlinear elasticity},
	journal = {Arch. Ration. Mech. An., 2001, 156, 89},
	number = {SISSA;35/00/M},
	year = {2001},
	publisher = {SISSA Library},
	doi = {10.1007/s002050100118},
	url = {http://hdl.handle.net/1963/1493},
	author = {Jean-Marc Mercier and Benedetto Piccoli}
}
