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The work of the first author was partially supported by the National Science Foundation under Grant NSF ENG77-28444.
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Fuhrmann, P.A., Willems, J.C. Factorization indices at infinity for rational matrix functions. Integr equ oper theory 2, 287–301 (1979). https://doi.org/10.1007/BF01682672
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DOI: https://doi.org/10.1007/BF01682672