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Communicated by G. Fichera
The work presented in this paper was done under a Fulbright research grant at the University of Rome and under a National Science Foundation grant GP-06208.
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Zachmanoglou, E.C. Non-uniqueness of the cauchy problem for linear partial differential equations with variable coefficients. Arch. Rational Mech. Anal. 27, 373–384 (1968). https://doi.org/10.1007/BF00251440
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DOI: https://doi.org/10.1007/BF00251440