MathSciNet bibliographic data MR792830 (86k:35087) 35L70 (35L67) Godin, Paul Propagation of $C\sp \infty$$C\sp \infty$ regularity for fully nonlinear second order strictly hyperbolic equations in two variables. Trans. Amer. Math. Soc. 290 (1985), no. 2, 825–830. Article

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