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Dedicated to Charles Loewner
This paper was prepared under the sponsorship of NSF Grant 21344.
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Bergman, S. On the coefficient problem in the theory of a system of linear partial differential equations. J. Anal. Math. 11, 249–274 (1963). https://doi.org/10.1007/BF02789987
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DOI: https://doi.org/10.1007/BF02789987