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The authors are members of the CNR group GNAFA.
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Colombini, F., Spagnolo, S. Second order hyperbolic equations with coefficients real analytic in space variables and discontinuous in time. J. Anal. Math. 38, 1–33 (1980). https://doi.org/10.1007/BF03033876
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DOI: https://doi.org/10.1007/BF03033876