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Precision reflectivity spectra of the tetragonal ZnP,, CdP, for E I I c, E 1 c and monoclinic ZnP,

We consider the Cauchy problem for a nonstrictly hyperbolic equation of arbitrary order with constant coefficients. The operator in the equation is a composition of first-order differential operators. The equation is supplemented with Initial conditions. We find the solution of this problem on a half-plane in analytic form in the case of two independent variables under some conditions on the coefficients.