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Supported in part by National Science Foundation grant MCS77-18 723
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Kashiwara, M., Kawai, T. & Sjöstrand, J. On a class of linear partial differential equations whose formal solutions always converge. Ark. Mat. 17, 83–91 (1979). https://doi.org/10.1007/BF02385459
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DOI: https://doi.org/10.1007/BF02385459