Abstract.
We give in this paper two explicit examples of nonsolvable weakly hyperbolic operators with real coefficients in two-space-dimensions.
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Pravda-Starov, K. Explicit examples of nonsolvable weakly hyperbolic operators with real coefficients. Bull Braz Math Soc, New Series 38, 397–425 (2007). https://doi.org/10.1007/s00574-007-0052-3
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DOI: https://doi.org/10.1007/s00574-007-0052-3