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Prepared under N. S. F. Grant No. GP-2159.
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Wasow, W. Asymptotic decomposition of systems of linear differential equations having poles with respect to a parameter. Rend. Circ. Mat. Palermo 13, 329–344 (1964). https://doi.org/10.1007/BF02849459
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DOI: https://doi.org/10.1007/BF02849459