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An erratum to this article is available at http://dx.doi.org/10.1007/BF02393210.
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Schecter, S., Singer, M.F. Separatrices at singular points of planar vector fields. Acta Math. 145, 47–78 (1980). https://doi.org/10.1007/BF02414185
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DOI: https://doi.org/10.1007/BF02414185