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Research on this paper was supported by NSF grant nos. MCS77-00966 and MCS77-01517.
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Ball, J.A., Helton, J.W. Nonnormal dilations, disconjugacy and constrained spectral factorization. Integr equ oper theory 3, 216–309 (1980). https://doi.org/10.1007/BF01682993
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DOI: https://doi.org/10.1007/BF01682993