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Dedicated to my teacher Yu. J. Lyubich on the occasion of his 60th birthday
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Phóng, V.Q. The operator equationAX−XB=C with unbounded operatorsA andB and related abstract Cauchy problems. Math Z 208, 567–588 (1991). https://doi.org/10.1007/BF02571546
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DOI: https://doi.org/10.1007/BF02571546