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Sibuya, Y. (1971). Perturbation at an irregular singular point. In: Urabe, M. (eds) Japan-United States Seminar on Ordinary Differential and Functional Equations. Lecture Notes in Mathematics, vol 243. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0058725
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DOI: https://doi.org/10.1007/BFb0058725
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