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Communicated by C. Müller
This paper was written while the author was NAS-NRC postdoctoral Research Associate.
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Lagnese, J.E. The fundamental solution and Huygens' principle for decomposable differential operators. Arch. Rational Mech. Anal. 19, 299–307 (1965). https://doi.org/10.1007/BF00250215
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DOI: https://doi.org/10.1007/BF00250215