MathSciNet bibliographic data MR906816 (88m:35101) 35L65 (35L67 58C27) Schaeffer, David G.; Shearer, Michael Riemann problems for nonstrictly hyperbolic $2\times 2$$2\times 2$ systems of conservation laws. Trans. Amer. Math. Soc. 304 (1987), no. 1, 267–306. Article

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