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This work was supported in part by the Deutsche Forschungsgemeinschaft (DFG)
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Engel, KJ. Polynomial operator matrices as semigroup generators: the 2×2 case. Math. Ann. 284, 563–576 (1989). https://doi.org/10.1007/BF01443351
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DOI: https://doi.org/10.1007/BF01443351