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Both authors were partially supported by grants from NSF Raúl Curto was partially supported by a University of Iowa faculty scholar award
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Curto, R.E., Fialkow, L.A. Recursively generated weighted shifts and the subnormal completion problem. Integr equ oper theory 17, 202–246 (1993). https://doi.org/10.1007/BF01200218
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DOI: https://doi.org/10.1007/BF01200218