On Cauchy's problem for hyperbolic equations and the differentiability of solutions of elliptic equations
Matematika, Tome 1 (1957) no. 1, pp. 43-59.

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     author = {Peter D. Lax},
     title = {On {Cauchy's} problem for hyperbolic equations and the differentiability of solutions of elliptic equations},
     journal = {Matematika},
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Peter D. Lax. On Cauchy's problem for hyperbolic equations and the differentiability of solutions of elliptic equations. Matematika, Tome 1 (1957) no. 1, pp. 43-59. http://geodesic.mathdoc.fr/item/MAT_1957_1_1_a3/